toolsku

Free online toolbox for everyday tasks

300+ free online tools for images, PDF, JSON, and text. Runs locally in your browser—no signup required.

Quick Access

One-click access to frequently used tools

PDF Tools

Merge, split, convert to/from images, reverse page order, metadata, watermark, compress, and more — all processed locally in your browser. 100% free, runs locally in your browser—nothing is uploaded to our servers.

JSON Tools

Format, YAML/TOML/CSV conversion, JSONPath, JMESPath, structural diff, TypeScript types—all under /json. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Text Processing

Case conversion, line sorting/cleanup, HTML to plain text, indent, line numbers, line wrapping, statistics, find & replace, regex, diff, Lorem, slug, ROT13, and more. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Image Tools

Format conversion, compress, resize, flip/rotate/filter, watermark, collage, EXIF, OCR, and more. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Video Tools

Convert, trim, compress, GIF export, and audio extraction—processed locally with ffmpeg.wasm in your browser. 100% free, nothing uploaded.

Encoding & Crypto

Base32/58/64, URL, Hex, escape, hash, HMAC, AES, RSA-OAEP, XOR, Vigenère, CRC32, QR code encode/decode, and more. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Utilities

Timestamp, various IDs, unit conversion, ASCII, financial & phone validation, encoding tables, barcode, and other misc tools. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Web & SEO

Share card preview, robots/sitemap, CSP, Permissions-Policy, .env, security headers; plus URL/MIME, HTML/SVG/Markdown, UA, color, and accessibility tools. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Documents & Productivity

CSV & Markdown tables, full-width/half-width, RMB uppercase, calendar & vCard, email headers, and more. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Development & APIs

GraphQL, OpenAPI, Properties, XML, SemVer, Mermaid, EditorConfig; plus JWT, config & JSON toolchain, SQL, networking & certificates, compression, and base conversion. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Tool and technology topics

Focused paths through Toolsku's most useful task-based tools and validated technical content.