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Tools

Everything runs locally. Your data never leaves the browser.

Tools

Music search

Search NetEase Cloud Music, QQ Music, Kugou and Qianqian in one place and listen right here: lyrics, seek, volume, next/prev and paging included; VIP and unavailable tracks are greyed out and skipped.

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JSON Studio

Format, minify, sort, validate with exact error positions, and diff two JSON documents. Runs entirely in your browser.

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Timestamp

Convert Unix timestamps and dates both ways, auto-detecting seconds vs milliseconds. Also shows ISO 8601, RFC 2822, relative time, day-of-year, ISO week, and a multi-timezone table.

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Regex Lab

Test regular expressions live: highlight hits, list every match with positions and groups, preview replacements, and start from built-in templates for email, URL, IPv4, dates and more.

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Encode / Decode

Base64, Base64URL, URL, HTML entities, Unicode escapes and hex — plus JWT decoding with exp / nbf checks. Everything runs locally; tokens never leave the browser.

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Text Diff

Line-by-line diff with added and removed rows, plus word-level highlighting. Ignore case or whitespace, and export a standard unified diff in one click.

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Hash & Checksum

Compute CRC32, MD5 and SHA-1/256/384/512 at once — for text or a file. Paste an expected checksum and it tells you which one matches.

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Generator

Generate UUID v4 / v7, ULID, passwords, random strings and slugs. Passwords show live entropy and strength, with an option to exclude lookalike characters such as O0Il1.

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Color & Contrast

Parse hex / rgb / hsl, convert between notations, and compute WCAG contrast with AA / AAA levels. Includes a full 50–900 tint ramp and tells you whether text on a colour should be black or white.

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Base & Units

Convert between any bases from 2 to 36 with grouped binary and byte views, plus ten unit categories — length, mass, area, volume, data, time, speed, pressure, energy and temperature — each listing every equivalent at once.

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Image Compress

Resize, rotate, flip and convert images (WebP / JPEG / PNG) right in the browser, with an automatic quality search to hit a target file size. Nothing is uploaded — it all runs on a local canvas.

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Cron parser

Expand a five-field cron expression into its values and list the next five run times. Ranges, steps, lists and names like JAN or MON are supported, including the DOM/DOW union rule.

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Bit workbench

A bit workbench: base conversion, 8/16/32-bit fixed-width views, per-bit inspection and toggling, byte breakdown, popcount plus leading and trailing zero counts, and an IEEE 754 double breakdown.

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CSV studio

Parse and build CSV per RFC 4180, including delimiters and newlines inside quotes and doubled quotes for a literal one. Sniffs the delimiter (comma, tab, semicolon, pipe), previews the table, converts to and from JSON.

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JWT inspector

Split a JWT into header and payload, flag exp/nbf/iat as expired, not yet valid or fine, and verify or re-sign HS256/384/512 with WebCrypto. Everything runs locally; the token never leaves the page.

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Text lab

Counts for mixed Chinese and English text (including UTF-8 bytes, code points and reading time), word frequency and Shannon entropy, naming-style conversion, slug generation, plus one-off line operations: trim, dedupe, sort, number, join.

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IP & Subnet Calculator

Unpack an address like 10.0.0.1/24: network, broadcast, usable range, mask and wildcard, binary and hex, plus reserved-range detection. Split a block into smaller subnets, or find the smallest block covering two addresses.

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URL Inspector

Split a URL into protocol, host, port, path, query and fragment, edit each part and rebuild it. Query parameters are listed individually so duplicates survive; includes percent encoding and a warning for sensitive parameters.

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Date Calculator

Days, weeks and business days between two dates; add or subtract years, months and days; leap year, ISO week, day of year and weekday all at once. Everything is computed at UTC midnight, so local time and DST cannot skew it.

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Unicode Inspector

For the same text, code points, grapheme clusters, UTF-8 bytes and display width all differ. This tool lists each code point in hex and decimal, flags combining marks and wide characters, and shows all four normalization forms.

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JSON Path Query

Pull nodes out of any JSON with $.a.b, $[0], $[*], $..name and $[?(@.id > 10)]. Results come back as a path list you can copy as values or as JSON. Everything runs in the browser; nothing is uploaded.

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Morse code

Convert text to Morse and back: letters, digits, punctuation and prosigns, with the total transmission time and audio playback. Full-width dots and dashes are normalised first.

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Roman numerals

Convert between Arabic and Roman numerals from 1 to 3999. Decoding is strict, so IIII or VX are rejected, and the breakdown shows which values a number uses.

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HTTP status codes

Look up HTTP status codes by number or keyword: 39 common codes in five classes, each with a one-line note in three languages plus an MDN link.

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Password generator

Generate random passwords by length and character set, with an entropy estimate. Charset, look-alike exclusion and batch generation all happen locally.

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Seewo Lock Config

Parse a Seewo lock-screen config (SeewoLockConfig.ini / .lock_backup): AES-128-CBC pulls out DeviceId and LockPasswardV3, HMAC-SHA256 verifies or brute-forces the six-digit lock password, and an RSA-2048 key decodes the QR activation code after the bundled tool swaps the device public key. Everything runs in your browser — nothing is uploaded. For administrators recovering their own devices.

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JSON to TypeScript

Turn a JSON sample into ready-to-use TypeScript types. Array elements are shape-merged: keys present in only some samples become optional, conflicting types become unions, and nested objects get names automatically. Choose interface or type, and readonly.

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Unit converter

Convert length, mass, data, time, speed and temperature. Factors follow SI where possible; temperature uses its own formulas and results keep significant digits.

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Case converter

Convert text between camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Acronym and digit boundaries are handled, and the input style is detected.

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Subtitle Timing

Convert between SRT and WebVTT, shift the whole timeline (for when sync drifts), rescale by a speed factor, and check cue count, span and overlaps. The parser is deliberately forgiving: index lines optional, comma or dot, CRLF and BOM all accepted.

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Classical ciphers

Encrypt and decrypt with Caesar, ROT13, Atbash and Vigenere. Letter case and non-letters are preserved, and invalid keys are explained rather than silently ignored.

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Aspect ratio

Work out an aspect ratio, reduce it to the smallest integers, and scale the other side to a given width or container. Common ratios are one click away.

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Speed test

Measure download, upload and latency through public speedtest nodes — throughput curves and per-platform latency as charts, plus peak, median, jitter and a broadband tier estimate.