What's New on CacheSleuth
A summary of what changed in the redesign, including new tools, dark mode, and translation support.
The Big Picture
Site-wide improvements that apply to every page.
Mobile-first and responsive
Every page works at phone widths first and scales up to desktop. The desktop sidebar is sticky on the left, and the mobile drawer slides out on demand.
Dark mode
Every tool, panel, and code table now has a proper dark theme. The site follows your system preference by default, and you can toggle it manually from the header.
Faster everything
Pages are served as static HTML, and each tool only loads the JavaScript and CSS it actually needs.
Findable tools
Tools are re-categorized and tagged with keywords. The homepage search bar finds them by name, cipher, or description. You can also paste coordinates directly into it!
Quality of Life
Smaller refinements throughout the site.
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Smart search bar. Paste coordinates in any notation and the search bar routes you to the Coordinate Converter. Type a cipher name and it opens the right tool. Partial matches show an autocomplete dropdown.
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My Puzzle Texts drawer. A cross-page scratchpad for ciphertexts, keys, custom alphabets, and any other text you want handy across tools. Saved locally in your browser, with Export and Import for backups. Click into any tool field and press Insert, or use Pick a field to choose a target from a list. Open it from the button in the sidebar.
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Reorganized sidebar. Tools are grouped by what they do, with quick-jump panels for codes, geocaching links, and translations. You can quickly filter the results here too and just press enter to go to the first result. The mobile drawer mirrors the desktop sidebar exactly.
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Inline "Learn more" accordions. Homepage tool cards have an expandable summary of what each tool does, so you can review the description without opening the tool.
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Featured tools shuffle. The homepage spotlights three tools at random. Press "Reshuffle" to swap in a different set.
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Embeddable tools. The Coordinate Converter can run as an embedded widget on the homepage and inside other tool pages on the site, with all of its features intact.
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Shareable tool URLs. Many tools encode their input into the URL, so you can copy the address bar to share or bookmark a specific puzzle state.
Tools & Upgrades
Every tool was individually re-thought during the redesign with the goal of making it the best version of itself, and every tool now ships with worked Examples built in, which the old site did not have. On top of that, the redesign added a stack of brand-new tools, including codes broken out of the Multi Decoder into their own pages. The flagship tools come first, followed by everything new since the old site, then the upgrades to tools that carried over.
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Multi Decoder
Rewritten from the ground up. Paste cipher text and the decoder runs every supported code at once, with separate slots for keywords, alphabets, and number sequences. Results are now ranked so the most likely "possible words" float to the top, and a filter lets you hide every section that did not produce a result. There is also a Share button that builds a link with your exact input and settings baked in, so you can hand it to someone else and they land on the same view. The list of supported ciphers is added to periodically.
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Wherigo Solver
Drop a
.gwccartridge and the solver decompiles the Lua code, scans the zone data, and ranks the most likely final coordinates with a confidence score. Reverse Wherigo presets for the Waldmeister and day1976 cartridge formats are included. -
Multi Encoder
Brand new for the redesign. Type a plaintext message, optionally provide keywords or a custom alphabet, and the encoder produces every supported cipher, code, and number-base representation at once. Output is grouped by family with a search filter, copy button per row, and a Share Link that round-trips back through the Multi Decoder.
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Cipher Identifier
Brand new for the redesign. Paste an unknown ciphertext and the identifier scores it against the full cipher catalog, surfaces the most likely candidates, and offers a one-click jump to the matching tool with your text already loaded. It also spots structural giveaways like Morse, Morbit, base conversions, and cryptarithm equations.
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Code Identifier
Brand new for the redesign. Upload a photo of an unknown symbol alphabet, like pigpen, Dancing Men, or alien glyphs, and it matches the shapes against its catalog of symbol codes to tell you which alphabet a puzzle is using.
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Geocache Viewer
Multiple input methods are supported: drop a saved cache page, paste the raw HTML, or use one of the browser extensions or bookmarklets that send the page directly from geocaching.com into the viewer. The viewer reformats the page into a cleaner layout and surfaces details that the live site does not show. Everything runs in your browser.
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Coordinate Converter
Converts between DD, DDM, DMS, UTM, MGRS, Plus Code, Maidenhead, Geohash, GeoHex, Geo3x3, NAC, Mapcode, OSGB, Mercator, and both Reverse Wherigo formats (Waldmeister and day1976) at the same time. Includes elevation lookup, a map view, and one-click links out to Google Maps, OpenStreetMap and other mapping services. The converter also runs as an embeddable iframe on other pages so you can get full coordinate conversion functionality in multiple places.
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Codes & Symbols
Over 318 code tables, most of them interactive so you can type your own message and see every variant render at once. Filter by name, or pick "Show All Codes" to render a single phrase across every monoalphabetic code on one page, which is useful for figuring out which code a puzzle is using.
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Geocaching Quick Search
A new homepage card and a dedicated sidebar mode let you jump to a cache page, log a find as any log type, look up a user's profile, hides, trackables, or stats, search FTF or recently published caches by region, or open your own dashboard.
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Code Image Decoder
Upload a picture of a message written in a symbol alphabet, like pigpen, braille, or other glyph codes, and the decoder finds each glyph, identifies the family, matches every symbol against its reference set, and reads the whole thing back into letters. It checks the result against a dictionary and coordinate patterns to flag a likely answer.
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Cryptogram Solver
Paste a monoalphabetic substitution (Aristocrat or Patristocrat) and the solver runs a hill-climb against an English quadgram model to recover the most likely plaintext, with runner-ups. It auto-detects Caesar shifts, Atbash, and keyword alphabets, and you can lock known letters or whole words to refine the result. It is also available as an optional toggle inside both Multi Decoders.
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Anagram Solver
Enter letters, a word, or a phrase and the solver finds every dictionary word and multi-word phrase that uses them, with Scrabble and Words With Friends tile scoring and crossword-style pattern filters. Switch between a readable common-words list and a 235,000-word full dictionary, and filter by length or a word that must appear.
Brand-new tools
Over 117 new tools, grouped by theme and sorted newest first. Tap a group to expand it.
Puzzle & logic solvers 21 tools
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Binairo Jun 2026Solve a Binairo/Takuzu puzzle of 0s and 1s from its given cells.
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Bridges Jun 2026Solve a Bridges/Hashiwokakero puzzle of islands and bridges.
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Futoshiki Jun 2026Solve a Futoshiki puzzle from its given digits and inequality signs.
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Heyawake Jun 2026Solve a Heyawake puzzle from its rooms and black-cell counts.
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Hitori Jun 2026Solve a Hitori puzzle by finding which numbered cells to shade.
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Kakuro Jun 2026Solve a Kakuro/cross-sums puzzle from its run clues.
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KenKen Jun 2026Solve a KenKen or Mathdoku puzzle from its cages and target numbers.
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Light Up Jun 2026Solve a Light Up/Akari puzzle by placing the bulbs.
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Magic Square Jun 2026Complete a magic square so every row, column, and diagonal share one sum.
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Mastermind Solver Jun 2026Crack a Mastermind code from known guesses and peg feedback.
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Masyu Jun 2026Solve a Masyu puzzle by drawing its single closed loop through the pearls.
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Numberlink Jun 2026Solve a Numberlink puzzle by connecting each pair of numbers.
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Nurikabe Jun 2026Solve a Nurikabe puzzle by shading the sea around its islands.
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SET Solver Jun 2026Find every valid set on a board of SET cards.
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Skyscrapers Jun 2026Solve a Skyscrapers puzzle from its edge clues and any given heights.
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Slitherlink Jun 2026Solve a Slitherlink puzzle by drawing its single closed loop.
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Logical Solver Jun 2026Solve logic grid puzzles with automatic deduction.
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Game of Life Jun 2026Interactive Conway's Game of Life grid with drawing, stepping, play controls, wrapping, and classic presets.
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Nonogram Solver Jun 2026Solves picross and griddler puzzles from row and column clues, with logic propagation and search fallback.
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Number Pyramid Jun 2026Fills missing blocks in additive number pyramids where each block is the sum of the two below it.
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Tower of Hanoi Jun 2026Generates the optimal move sequence for any disk count and animates the solution step by step.
Word, anagram & text tools 7 tools
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Magic Eye Text Generator Jun 2026Hides words inside monospace text that float into view when you relax your eyes.
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Scrabble Scorer Jun 2026Scores a known Scrabble or Words With Friends play with premium squares, blanks, and bingo bonus support.
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Word Search Jun 2026Generates word search grids from your list or solves a pasted grid by finding every hidden word.
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Wordoku Jun 2026Solves nine-letter sudoku grids and lists rows and diagonals so hidden themed words are easier to spot.
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Zalgo Text Generator Jun 2026Adds stacked combining marks for glitch text and strips them back out again.
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Spelling Alphabet Apr 2026Converts text to phonetic spelling-alphabet code words.
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Upside-Down Text Apr 2026Rotates text 180 degrees with Unicode look-alike characters and can unflip it back.
Ciphers & secret writing 14 tools
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Spam Mimic Jun 2026Hides a short message inside fake junk mail, a fake PGP block, or invisible whitespace.
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TAPIR Substitution Jun 2026Decodes and encodes the DDR substitution table for letters, digits, and punctuation.
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Navajo Code Talkers Jun 2026Encodes and decodes the WWII Type One alphabet that maps letters to Navajo words.
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RSA Jun 2026Small-key BigInt RSA demo for puzzle use, with key generation, number encryption, and text encryption.
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Book Cipher Decoder May 2026Decode page, line, word, and character references against a source text.
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Numeric Homophonic Cipher May 2026Homophonic substitution where each letter can be written with several different number tokens.
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Cryptarithm Solver May 2026Solves alphametic puzzles like SEND + MORE = MONEY, including comparison operators and extra conditions.
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Grandpré May 2026Homophonic cipher on a configurable 10x10 letter grid, where repeated letters give several valid coordinate pairs.
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Morbit May 2026Encodes plaintext as Morse, reads the symbol stream in pairs, and maps each pair to a digit from a 9-position key.
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Spirit DVD Code May 2026Encodes and decodes the line-and-dash message from the Mars rover Spirit DVD.
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AMSCO Cipher Apr 2026Encodes and decodes the incomplete columnar transposition that alternates single letters and pairs.
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Ragbaby Cipher Apr 2026Solves the keyed substitution cipher that shifts each letter by its running position across the words.
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RC4 Cipher Apr 2026Educational stream-cipher tool that XORs text with a key-derived keystream and outputs text, hex, or Base64.
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Solitaire Cipher Apr 2026Implements Bruce Schneier's Pontifex cipher, where a deck of cards generates the keystream.
Numbers, dates & converters 32 tools
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Amicable Numbers Jun 2026Find a number's amicable partner where each equals the sum of the other's proper divisors, and list every amicable pair up to a limit.
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Armstrong (Narcissistic) Numbers Jun 2026Check if a number equals the sum of its digits each raised to the digit count, and list every Armstrong number up to a limit.
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Automorphic Numbers Jun 2026Check if a number's square ends in the number itself, with the matching tail highlighted, and list every automorphic number up to a limit.
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Catalan Numbers Jun 2026Catalan numbers via arbitrary precision: generate the first terms, look up C(n), or test whether a number is Catalan.
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Collatz Conjecture (3n+1) Jun 2026Trace any number's Collatz hailstone sequence, step count, and peak, or find the most stubborn starter up to a limit.
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Factorions Jun 2026Sum the factorials of a number's digits repeatedly to see if it is a factorion, reaches one, or enters a cycle.
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Figurate Numbers Jun 2026Triangular, square, pentagonal, hexagonal, and tetrahedral numbers: generate, look up a term, or test membership.
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Happy Numbers Jun 2026Tests whether a number is happy by showing its full digit-square chain, and lists every happy number up to a limit.
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Harshad (Niven) Numbers Jun 2026Check if a number is divisible by the sum of its digits, see the quotient, and list every Harshad number up to a limit.
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Kaprekar's Constant (6174) Jun 2026Run Kaprekar's routine to 6174 or 495 with the full chain, and check or list Kaprekar numbers.
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Lychrel Numbers (196) Jun 2026Reverse-and-add any number to a palindrome and see the chain and iteration count, or flag it as a Lychrel candidate.
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Mersenne Numbers Jun 2026Mersenne numbers (2 to the n, minus 1) with prime flagging: generate, look up M(n), or test for one less than a power of two.
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Pronic (Oblong) Numbers Jun 2026Pronic numbers n(n+1): generate the first terms, look up P(n), or test whether a number is the product of two consecutive integers.
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BCD Code Jun 2026Converts decimal digits to and from Binary-Coded Decimal.
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D'Ni Number Converter Jun 2026Converts between decimal and the D'ni base-25 number system.
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Date Calculation Jun 2026Adds or subtracts calendar time from a date.
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Date Difference Jun 2026Counts the number of days between two dates.
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Day of the Week Jun 2026Finds the weekday for any Gregorian calendar date.
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Genetic Code Translator Jun 2026Translates DNA and RNA codons into amino acids.
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Julian Date Converter Jun 2026Converts between calendar dates and Julian Day numbers.
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Nth Day of the Year Jun 2026Converts between dates and day numbers within a year.
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Number Cruncher Jun 2026Analyze a single integer for bases, factors, primality, and special-number properties, then run related BigInt worksheet expressions with variables.
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Babylonian Numbers Jun 2026Converts decimal numbers to and from base-60 cuneiform tens and units wedges.
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Cistercian Numbers Jun 2026Draws and reads the medieval monastic numeral glyphs that encode 0 to 9999 in one mark.
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Gray Code Jun 2026Converts between decimal, standard binary, and reflected binary Gray code.
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Maya Numbers Jun 2026Converts between decimal values and Maya base-20 dot, bar, and shell numerals.
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Big Number Calculator May 2026Calculate with very large integers in decimal, hex, octal, or binary.
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Time Decimal May 2026Converts times of day to seconds since midnight and percent of day elapsed, for coordinate-from-time puzzles.
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Tupper's Self-Referential Formula May 2026Plots the bitmap for any k value, and goes the other way: draw a bitmap and it finds the k that draws it.
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Beghilos Calculator Spelling Apr 2026Turns words into upside-down calculator numbers, or flips a number to read the hidden word.
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Punycode Apr 2026Converts Unicode domain names to and from the ASCII Punycode labels used by IDNA.
Coordinate, map & geocaching tools 17 tools
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Distance to Horizon Jun 2026Calculates how far away the horizon is from a given height.
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Transportation Code Explorer Jun 2026One search box that recognizes airline, airport, callsign, flight, aircraft, runway, registration, ICAO 24-bit, UN/LOCODE, railroad, and shipping codes, then explains each and links related identifiers.
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Centroid of Points Jun 2026Finds the geographic center of any list of coordinates with a 3D cartesian average.
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Coordinate Averaging Jun 2026Averages multiple GPS readings of one spot into a single best-estimate coordinate and reports the spread.
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Formula Solver Jun 2026Evaluates puzzle formulas with letter variables, ranges, cross sums, word values, trig, roots, constants, and references between formulas.
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Geohashing Jun 2026Computes the xkcd geohash point from a date, graticule, and Dow Jones opening value, then plots it on a map.
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Polygon Area, Perimeter & Centroid Jun 2026Finds the area, perimeter, and center of gravity of any polygon.
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Rhumb Line Jun 2026Calculates the constant-bearing course and distance between two coordinates, alongside the great-circle comparison.
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Segment a Line Jun 2026Divides the path between two coordinates into equal segments and lists each intermediate point.
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Variable Coordinate Calculator Jun 2026Expands coordinate formulas with variable ranges, parses every candidate, maps the results, and exports the list.
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Antipode Finder May 2026Finds the point on the exact opposite side of the Earth from any coordinate.
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Log Sheet Builder May 2026Design and print your own geocache log sheets and log rolls, entirely in your browser.
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Geoart Builder May 2026Builds paired posted and final coordinates for geocache geoart layouts.
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Datum Transform Apr 2026Converts coordinates between geodetic datums and ellipsoids with Helmert transformations.
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Multi Location Maze (Trekkie79) Apr 2026Decodes or builds the 11-character Multi Location Maze Wherigo code.
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Orthogonal Projection Apr 2026Drops a perpendicular from a point onto a line and reports the nearest point, cross-track distance, and along-track distance.
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Resection Apr 2026Finds your position by crossing back-bearings from three known landmarks and reports the triangle of error.
Image, audio & visual tools 13 tools
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Animation Frame Splitter Jun 2026Splits animated images into individual frames for inspection.
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Audio Morse Decoder Jun 2026Decodes Morse beeps from an audio file or microphone input.
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Symbol Explorer Jun 2026Identify, search, and decode symbols and special characters.
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Vector Path Decoder Jun 2026Decodes Logo-style pen path commands into drawings and encodes text back into vector commands.
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X and Y Code Art Generator Jun 2026Renders text as five-bit Baudot-style color columns inspired by X&Y album art.
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Animated Morse Decoder Jun 2026Reads blinking-light GIF frames as on/off runs, converts the flashes to Morse, then decodes the text.
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Binary to Image Jun 2026Renders bits or bytes as a bitmap and can read an image back into a 0/1 stream.
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File Carver Jun 2026Scans uploaded files for embedded signatures and appended data, then carves each find into a download.
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Hex Viewer Jun 2026Opens any file as a hex dump with offsets, ASCII, byte-range controls, and printable-string extraction.
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Image Color Tools Jun 2026Adjusts brightness, contrast, channels, bit planes, flips, rotations, and stretching to surface hidden marks.
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Image Steganography Jun 2026Hides text in image least-significant bits, extracts hidden messages, and supports raw LSB inspection.
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Magic Eye Solver Jun 2026Reveals the hidden depth image inside an autostereogram by comparing the picture against shifted copies.
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Visual Cryptography Jun 2026Splits a black-and-white secret into two random-looking shares, or overlays shares to reveal the hidden image.
Codes & encodings 13 tools
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Colored Squares Code Jun 2026Build the colored-squares substitution code with fully customizable colors, a clickable alphabet, and PNG export.
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Base100 May 2026Encodes bytes as emoji codepoints and decodes them back to text.
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Base62 May 2026Alphanumeric base conversion with two common alphabet orders.
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Base32 May 2026RFC 4648 Base32 encoding for text and binary data.
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Base58 May 2026Base58 encoding with Bitcoin and Flickr alphabets.
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DTMF May 2026Decode and encode the dual-tone phone keypad tones.
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Nihilist May 2026Polybius-square cipher with a keyword-based additive layer.
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Numbers in Alphabetical May 2026Sorts 0 to 100 by their English spelling and converts numbers to and from words.
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Numerology May 2026Pythagorean and Chaldean numerology for words and names.
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Segment Display May 2026Encode and decode characters drawn on 7, 9, 14, or 16-segment displays. Rebuilt from the old seven-segment code with an encode mode and a supported-characters panel.
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Number Pad Lines Apr 2026Draws the keypad-line shapes for letters and numbers.
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Planet Apr 2026Encode and decode USPS PLANET five-bar digit barcodes.
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Postnet Apr 2026Encode and decode USPS POSTNET five-bar digit barcodes.
Upgrades to existing tools
- Automatic Vigenère-family solvers. A Solve automatically button now cracks the key straight from the ciphertext on Vigenère, Autokey, Beaufort, Variant Beaufort, Gronsfeld (each with autokey variants), and Porta Key.
- Cipher Identifier recognizes Morbit and cryptarithms. A 1-9 digit stream flags Morbit, and a "WORDS + WORDS = WORDS" equation flags a cryptarithm, each with a link to open the solver pre-loaded.
- Auto coordinate chip on every text field. When text containing a recognizable coordinate (DD, DDM, DMS, UTM, MGRS, Plus Code, OSGB, Reverse Wherigo, What3Words) lands in a tool, a "Possible coordinate" chip appears with a copy button and a one-click link into the Coordinate Converter.
- Cloud auto-solvers crack ciphers without a key. A Solve button now recovers the key and plaintext for Substitution, Playfair, Foursquare, Bifid, Trifid, Columnar Transposition, and ADFGX/ADFGVX. The heavy search runs in the cloud so it never freezes the page, and the same solvers power one-click cracking from the Cipher Identifier and Multi Decoder.
- Multi Decoder polish. A searchable Focus combobox isolates a single cipher, sections are themed and alpha sorted with per-card descriptions, a new Syllables card aids text analysis, and multi-token base conversion plus a walking-base decoder were added.
- Geocache Viewer converts every coordinate at once. The viewer's coordinate converter now harvests every recognizable coordinate from the pad and renders a full DD/DDM/DMS/MGRS/UTM card for each, so you can compare candidates side by side.
- Cryptogram solving built into the Multi Decoder. The new Cryptogram Solver is also available as an optional toggle inside both Multi Decoder and Multi Decoder (classic).
- More text-options on every input. Remove Newlines, Split Into Lines, and Normalize Spaces now sit alongside the existing case, filter, find/replace, and group buttons under any tool's text input.
Languages
CacheSleuth is now available in 10+ languages. Language names appear in their native script in the footer dropdown so you can find yours without scanning English labels. The old site used the Google Translate widget, which often broke JavaScript and stopped page features from working. The new translation runs through CacheSleuth's own translator instead, so tools keep working in any language. Translations are produced by a machine model, so some are still rough.
If you spot a translation that looks wrong or awkward, please report it on the translation feedback form. The form lets you correct several strings at once, and the fixes are applied as manual overrides that the whole site picks up on the next visit.
What Stayed The Same
- Every tool from the old site is still here, just better organized and easier to find. Each one has been enhanced where possible with new features and improvements.
- Tool URLs are unchanged where it was practical to keep them, so your bookmarks should keep working.
- Nothing requires an account, and nothing tracks you across the site.
- It is still free and ad-free.
Notice something missing or broken?
Please share your feedback if you see anything that looks off, or if you have an idea for a new feature or tool you'd like to see. While the redesign is feature complete, your input is still very welcome!
Share your feedback