Privacy-first tools that run in your browser
49 free utilities plus practical guides—all processing stays on your device. No uploads, no signup.
- 49
- Tools
- 7
- Languages
- 0
- Bytes uploaded
Why Safe Local Tools?
Privacy by default
Tools run in your browser tab. We do not receive the files or text you process.
No upload required
Formatting, conversion, and checks happen on-device—ideal for logs, drafts, and screenshots.
Seven languages
The same utilities and guides in English, Chinese, Spanish, Portuguese, Indonesian, Vietnamese, and Turkish.
- New
AI token counter
OpenAI GPT-5 / GPT-4o, Anthropic Claude, Gemini, Grok, DeepSeek, Qwen, Kimi, MiniMax, Codex token counts - 100% in-browser.
- Quick
Unix timestamp converter
Unix epoch seconds / milliseconds, readable dates, timezone-aware conversion - fast and 100% local.
- New
YAML / JSON converter
YAML <-> JSON conversion, pretty-print, copy-ready output - 100% in-browser.
JSON formatter
JSON validation, pretty-print, minify, configurable indent, copy-friendly output - 100% local.
- New
JSON diff
JSON comparison, line-level highlights, parse-error feedback, pretty-printed diff - in-browser.
JWT decoder
JWT header and claims decode, UTC exp / nbf / iat, optional HS256 / HS384 / HS512 verify - no upload.
Base64 encoder
UTF-8 text and binary files up to 60 MB, Base64 encode / decode, local processing, no upload.
Hash generator
SHA-256, SHA-384, SHA-512, SHA-1 hashes, Web Crypto support, lowercase hex output - 100% local.
Color converter
HEX, RGB, HSL, alpha support, native color picker, live preview, one-click CSS copy.
Regex tester
JavaScript regex testing, match indices, capture groups, inline highlights, standard flags - local engine.
URL encoder & decoder
URL encode / decode, query string parser, URL parts breakdown, UTF-8 safe - 100% local.
Word counter
Word, line, paragraph, character, grapheme cluster, UTF-8 byte counts - live and local.
- Hot
QR code generator
URL, Wi-Fi, vCard, plain text to PNG QR code, adjustable size and error correction - 100% local.
Password generator
Strong random passwords, Web Crypto randomness, adjustable length and character classes - never uploaded.
- New
Cron expression parser
Cron expression preview, next 5 run times, plain-English explanation, local parsing.
Markdown table generator
Spreadsheet rows to GitHub-flavored Markdown tables, live preview, copy-ready output - in-browser.
- Quick
Image & GIF compressor
PNG, JPEG, WebP, animated GIF, HEIC/HEIF, TIFF compression, high-fidelity output, lossless PNG, no upload.
Image resizer
PNG, JPEG, WebP photo resizing, longest-edge presets, fine slider, high-fidelity downscale - local only.
Image format converter
PNG, JPEG, WebP, AVIF format conversion, transparency preserved where supported, local re-encoding.
HEIC to JPG
iPhone HEIC / HEIF to JPG, private image decode path, high-quality JPEG output, 100% in-browser.
Image to text (OCR)
PNG, JPEG, screenshots and photos to text OCR, 100+ language packs, on-device processing, no upload.
- New
Document watermark & privacy masking
ID card, license, passport watermark and privacy masking, blur or pixelate sensitive areas, 100% local, no upload.
- New
ID photo background changer
ID photo background replacement, white / blue / red / custom colors, AI person segmentation, 100% in-browser.
- New
PDF compressor
PDF compression in-browser, private cloud-compressor alternative, no upload, no signup.
UUID generator
Bulk UUID v4 generation, crypto-random values, clipboard copy, .txt download - 100% local.
Case converter
camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE conversion - instant and fully local.
.env parser
.env validation, key listing, duplicate detection, normalized export copy - in-browser.
Prompt formatter
LLM prompt cleanup, trim ends, collapse blanks, normalize smart quotes - 100% local.
Text chunk splitter
Long document splitting, character or token budgets, overlap control, RAG / LLM ingest ready.
Transcript cleaner
ChatGPT, Claude, Gemini, Grok transcript cleanup, compact plain text output - 100% in-browser.
Rich text to plain
HTML / Markdown to clean plain text, datasets, prompts, search indexes - on-device.
LLM messages JSON
OpenAI-style chat messages JSON, system / user / assistant roles, vision content[] examples - in-browser.
Markdown to HTML
Markdown to HTML, headings, emphasis, code blocks, links, local rendering.
HTML minifier
HTML minify and beautify, production snippets, review-friendly formatting - stays on-device.
Favicon generator
Image to favicon.ico and PWA icons, 16 / 32 / 180 / 192 / 512 px sizes, local generation.
Text diff
Text comparison, line-by-line added / removed highlights, private local diff.
Age calculator
Age in years, months, days, total days, birth date to target date - 100% local.
BMI calculator
BMI calculator, metric and imperial units, category band, instant local result.
Unit converter
Length and temperature conversions, metric and imperial units, instant local results.
TOML converter
TOML <-> JSON conversion, direction toggle, pretty-print output - 100% in-browser.
- New
JSON to CSV converter
JSON arrays to Excel-ready CSV, nested field flattening, UTF-8 BOM, private browser processing.
- New
EXIF metadata remover
Photo GPS, camera, and timestamp metadata removal for JPEG images, local-only privacy protection.
- New
Log sanitizer
IP, email, phone, API key and token redaction, preview counts, clean logs for safe sharing.
- New
SVG to PNG/JPG converter
SVG to high-resolution PNG/JPG, custom width and height, icon export, fast local Canvas conversion.
- New
PDF merge and split
Merge multiple PDFs, split page ranges, ZIP export for pages, private browser-only processing.
- New
AES text encryptor
AES-GCM text encryption, PBKDF2 password keys, decrypt locally, copy encrypted JSON safely.
- New
Key format converter
RSA PEM to JWK, JWK to PEM, auto-detect key format, Web Crypto local conversion.
- New
Code to image generator
Code screenshots with gradients, window chrome, shadows, PNG export, social-ready local rendering.
- New
Local PDF encrypt/decrypt
AES-GCM PDF byte encryption, password-based decrypt, local encrypted package, no upload.