🛠️ Guide hub · 32 tools · 33 guides · Updated October 7, 2026
Text and developer guides: format, encode, compare and count
Small text jobs interrupt real work: a JSON payload that will not parse, a regex that matches too much, a timestamp in a log, a word limit on an application, a block of text in ALL CAPS. These guides explain the concept briefly and then show the fastest reliable fix.
The text and developer tools run entirely in your browser, so API keys, tokens and private data you paste are not sent anywhere. Even so, treat production secrets carefully and rotate any key that has been shared in plain text.
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Format JSON and Validate It: Indents, Sorting, Tree View
Format JSON so anyone can read it: syntax is checked as you paste, then pick 2-space, 4-space or tab indents, sort keys…
Regex Tester Online Free: Explain, Replace, Export Code
Regex tester that highlights every match, explains each token in plain English and exports JavaScript, Python and PHP…
Count Words in Text: How Counters Decide What Counts
Count words in text of any kind and understand the result: what counts as a word, sentence or paragraph, why Word and…
Generate MD5 and SHA-256 Hashes to Verify Files and HMAC
Generate MD5, SHA-1, SHA-256, SHA-512 and CRC32 hashes of text or files up to 2 GB, verify checksums and sign with…
Unix Timestamp Converter: 11 Formats, Any Time Zone
Paste a Unix timestamp in seconds, ms, µs or ns, or an ISO date, and get 11 copy-ready formats in any IANA time zone…
Compare Two Texts and Find Differences in Seconds
Compare two texts and find differences word by word: check edits, AI rewrites and final drafts, with ignore-case and…
Which tool do I need?
| If you want to… | Use |
|---|---|
| Format, validate or repair JSON | JSON Formatter |
| Test and explain a regular expression | Regex Tester |
| Read a Unix timestamp as a date | Unix Timestamp Converter |
| Verify a file checksum | Hash Generator |
| See what changed between two versions | Text Diff Checker |
| Hit a word or character limit | Word Counter |
| Remove line breaks, extra spaces or duplicate lines | Text Cleaner |
| Fix capitalization | Case Converter |
| Check text contrast for accessibility | Color Contrast Checker |
| See your design as color-blind people do | Color Blindness Simulator |
| Make bold, cursive or strikethrough text for a bio | Fancy Text Generator |
| Convert YAML to JSON or JSON to YAML | YAML to JSON Converter |
| Minify or beautify HTML, CSS and JavaScript | HTML, CSS & JS Minifier |
| Format or validate XML and test XPath | XML Formatter & Validator |
| Beautify a SQL query for your database | SQL Formatter |
| Write meta and Open Graph tags with a preview | Meta Tag & Open Graph Generator |
| Create a robots.txt and block AI crawlers | Robots.txt Generator & Tester |
| Build UTM campaign links for Google Analytics | UTM Builder |
| Read or build a cron schedule | Cron Expression Generator |
| Convert chmod permissions like 755 | Chmod Calculator |
| Check a domain's SPF, DMARC and DKIM records | Email DNS Checker (SPF, DMARC, DKIM) |
Free tools in this hub
JSON Formatter
Format, validate and minify JSON.
XML Formatter & Validator
Format, beautify or minify XML and check it is well-formed — line and column errors, comments and CDATA kept, XPath tester. Runs in your…
SQL Formatter
Format and beautify SQL for MySQL, PostgreSQL, SQL Server, Oracle, SQLite, BigQuery, Snowflake and more — keyword case, indent style…
HTML, CSS & JS Minifier
Minify or beautify HTML, CSS and JavaScript in your browser with Terser and CSSO — see bytes and gzip saved. Nothing is uploaded.
CSV to JSON Converter
Convert a CSV spreadsheet to JSON or JSON back to CSV — handles quoted fields and headers. 100% in your browser, private, free.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML in your browser — auto-detect, multi-document YAML, sort keys, indent options and line-by-line error…
Regex Tester
Test regular expressions live with highlighted matches.
Cron Expression Generator
Explain any cron expression in plain English and see the next run times in your time zone — build schedules, standard, Spring and Quartz…
Chmod Calculator
Convert Linux file permissions between checkboxes, octal (755, 644) and symbolic (rwxr-xr-x) — setuid, setgid, sticky bit, chmod commands…
Meta Tag & Open Graph Generator
Write SEO title, description, canonical, Open Graph and X card tags with live Google, Facebook, X and LinkedIn previews and pixel-width…
Robots.txt Generator & Tester
Create a robots.txt with disallow rules, sitemaps and one-click AI crawler blocking (GPTBot, ClaudeBot, Google-Extended), then test any URL…
UTM Builder
Build Google Analytics 4 campaign URLs with utm_source, utm_medium and utm_campaign — presets, lowercase cleanup, bulk tagging and link…
Base64 Encode / Decode
Encode text to Base64 or decode it back.
URL Encoder / Decoder
Encode or decode URL / percent-encoding.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text.
UUID Generator
Generate random UUID v4 identifiers.
JWT Decoder
Paste a JSON Web Token to read its header and payload instantly, with human-readable expiry dates. Decoding only, nothing uploaded. 100% in…
Unix Timestamp Converter
Convert Unix timestamps (seconds, ms, µs, ns — auto-detected) to dates in any time zone and back: ISO 8601, RFC 2822, relative time, ISO…
Markdown to HTML
Write Markdown and get clean HTML with live preview.
Text Diff Checker
Compare two texts and see what changed.
Word Counter
Count words, check readability and social media limits.
Case Converter
UPPERCASE, lowercase, Title Case and more.
Text Cleaner
Remove line breaks, extra spaces, duplicate or empty lines, HTML tags and emojis; sort lines, fix smart quotes and find & replace with…
Fancy Text Generator
Turn text into 27 Unicode styles — bold, italic, cursive script, gothic, bubble, small caps, upside down and strikethrough — and copy with…
Lorem Ipsum Generator
Placeholder text by paragraphs, sentences, words, characters or list items — classic Latin or realistic English, as plain text, HTML…
Color Converter
Convert colors between HEX, RGB and HSL, with a picker.
Color Contrast Checker
Check if your text and background pass WCAG AA and AAA accessibility, with a live ratio and preview. 100% in your browser, free.
Color Blindness Simulator
See any image or screenshot the way color-blind people do — protanopia, deuteranopia, tritanopia, their milder forms and achromatopsia…
CSS Gradient Generator
Design a beautiful gradient with unlimited color stops and copy the CSS in one click, or export a PNG. 100% in your browser, free.
Code to Image
Turn code into a beautiful, shareable image with syntax highlighting, a window frame and a gradient background — great for X, docs and…
Online Notepad
A clean, distraction-free notepad that autosaves in your browser. Download your notes as a .txt file — free, private.
Email DNS Checker (SPF, DMARC, DKIM)
Check a domain's MX, SPF (syntax, 10-lookup limit, duplicates), DMARC policy, DKIM selectors, MTA-STS, TLS-RPT and BIMI — a score out of…
Free Email Forwarding Setup Wizard
Forward you@yourdomain.com to Gmail or Outlook for free: detects your DNS host and current mail, picks Cloudflare Email Routing, Forward…
Guides by tool
JSON Formatter
Open tool →Regex Tester
Open tool →UTM Builder
Open tool →Base64 Encode / Decode
Open tool →URL Encoder / Decoder
Open tool →Hash Generator
Open tool →UUID Generator
Open tool →JWT Decoder
Open tool →Unix Timestamp Converter
Open tool →Markdown to HTML
Open tool →Text Diff Checker
Open tool →Word Counter
Open tool →Case Converter
Open tool →Lorem Ipsum Generator
Open tool →Color Converter
Open tool →Code to Image
Open tool →Online Notepad
Open tool →Frequently asked questions
Is it safe to paste tokens or JSON with personal data?
These tools process text locally in your browser and do not send it to a server. Still, avoid pasting live production secrets anywhere you do not control, and rotate a key if it has been exposed.
Does the JWT decoder verify signatures?
No. It decodes the header and payload, which are only Base64URL-encoded and readable by anyone. Verifying a signature requires the secret or public key on your server.
Is MD5 still safe?
MD5 and SHA-1 are fine for detecting accidental corruption but are broken for security uses. Use SHA-256 or stronger to verify downloads, and a dedicated password hashing algorithm such as bcrypt or Argon2 for passwords.
Why does my word count differ from Word or Google Docs?
Counters disagree on hyphenated words, numbers, URLs and symbols. For school or publishing limits, use the counter the institution names, and leave a small margin.
Which UUID version should I use?
Version 4 (random) is the safe default. Version 7 adds a timestamp prefix, which keeps database indexes ordered by creation time.
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