Free Developer Tools Directory — Browser-Based Utilities, No Upload
A directory of free developer tools, paired with a growing set of first-party, 100% client-side utilities. No ads, no signup, no upload — the built-in tools run entirely in your browser.
| Tool | What it does |
|---|---|
| Base64 Decode | Decode standard and URL-safe Base64, with invalid-byte diagnostics and a hex view |
| Base64 Encode | Encode text or files, URL-safe variant, line wrapping |
| JSON Formatter & Validator | Format, minify, sort keys, collapse to a tree view, diff two documents |
| SQL Formatter | Token-based beautifier and minifier; formatting never changes the token stream |
| HTML Minifier | Minify HTML/CSS/JS with <pre>/<script>/<style> protection, plus a beautifier |
| Regex Tester | Live matching, capture groups, flags, replace preview |
| JWT Decoder & Debugger | Decode header/payload and verify signatures (HS256/384/512, RS/ES256–512) |
| URL Encoder / Decoder | Component, strict RFC 3986, whole-URL and form-urlencoded modes |
| HTML Entity Encoder / Decoder | 218 named entities plus decimal/hex references, browser-accurate legacy matching |
| Text Diff | Line-level diff of two texts or code files |
| UUID Generator | v1/v4/v7, GUID, NanoID, ULID — bulk up to 500, CSV/JSON export |
| Hash Generator | MD5, SHA-1/256/512, CRC32, HMAC |
| Timestamp Converter | Unix seconds/ms/µs/ns auto-detection, 17 time zones, date arithmetic |
| Markdown Preview | Live Markdown rendering |
| QR Code Tools | Generate QR codes and decode them from an image |
| Image Compressor | Compress and convert images (PNG/JPEG/WebP) locally |
| Color Tools | HEX/RGB/HSL conversion and picking |
| CIDR Calculator | Subnet math for IPv4/IPv6 ranges |
Full list at 23232322.xyz.
| Category | Covers |
|---|---|
| API & Network | API clients, HTTP debugging, tunnels, load testing |
| Code & IDE | Editors, diffing, formatting, version control |
| Database & SQL | SQL clients, schema design, query analysis |
| DevOps & CI/CD | Containers, IaC, pipelines, secrets management |
| Dev Tools | Encoders, generators, converters, utilities |
| Frontend & Design | CSS, assets, colors, UI libraries |
| Security & Testing | TLS, pentesting helpers, scanners, test runners |
Each category page curates recommended third-party tools alongside the built-in ones.
The built-in tools run entirely in your browser — no server-side processing. Paste data, get results instantly. Nothing leaves your device.
- Vanilla JavaScript + HTML5 APIs
- Cloudflare Pages (global edge hosting)
- Zero external dependencies per tool page
MIT
- Live: 23232322.xyz
- More tools: sqlformat.io | imgloft.com | pagetext.io