Online Developer Tools
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In-Browser Developer Tools
Format, convert, and process text, code, images and PDFs
— entirely in your browser and with zero sign-up.
Why Choose WebUtils?
Lightning‑Fast
Instant results with 100% client‑side processing.
Privacy‑First
Your data stays on your device; nothing is uploaded to our servers.
Developer‑Friendly
Clean UI and intuitive flows help you work faster with fewer errors.
Multi-Window Workflow
Detach tools into separate windows to view input and output simultaneously on different screens with real-time sync.
Popular Developer Tools
Open the most useful browser-based tools for formatting, encoding, PDFs, authentication, and data conversion.
JSON Formatter and Validator Online | Format, Minify, Debug
Format, validate, minify, and inspect JSON with examples and local processing.
Base64 Encoder and Decoder Online | UTF-8 and URL-Safe Text
Encode or decode Base64 text with UTF-8 support for APIs, JSON, and debugging.
Hash Generator Online | MD5, SHA-256 and SHA-512 Checksums
Generate MD5, SHA-1, SHA-256, and SHA-512 digests for checksums and fingerprints.
URL Encoder and Decoder Online | Query String Percent Encoding
Encode and decode URL components, query strings, and UTF-8 percent-encoded text.
JWT Decoder Online | Decode Claims, Header and Expiration
Decode JWT headers and payload claims locally for auth and API debugging.
UUID v4 Generator Online | Bulk GUIDs with Web Crypto
Generate secure UUID v4 identifiers in bulk with case and hyphen options.
QR Code Generator Online | URL, Wi-Fi, vCard, PNG and SVG
Create QR codes for URLs, text, Wi-Fi, and contact data with downloadable output.
CSV to JSON and JSON to CSV Converter Online | Local Data Tool
Convert CSV to JSON or JSON to CSV for spreadsheets, APIs, and data cleanup.
PDF Merge Online | Combine PDF Files Locally with No Upload
Merge multiple PDF files locally with drag-and-drop ordering and no upload.
Image to PDF Converter Online | JPG, PNG and Screenshots to PDF
Convert JPG and PNG images into a PDF with page size, order, and rotation controls.
Workflow Guides
Use these focused guides to finish common developer tasks, then open the matching browser tool.
View all guidesFormat JSON for API debugging
Learn how to format, validate, and inspect API JSON responses so missing commas, wrong nesting, and invalid payloads are easier to find.
Read guideDecode a JWT safely before debugging authentication
Learn how to inspect JWT headers and payload claims without treating decoded tokens as verified or sharing secrets by accident.
Read guideBase64 decode an API payload
Learn how to decode Base64 API fields, inspect UTF-8 text safely, and avoid confusing encoding with encryption.
Read guideConvert CSV to JSON for spreadsheet data cleanup
Learn how to convert spreadsheet CSV exports into JSON while checking headers, delimiters, empty cells, and nested-looking values.
Read guideMerge PDF files privately in the browser
Learn how to combine PDF files in a browser workflow while checking page order, file names, and sensitive document handling.
Read guideVerify a file checksum with SHA-256
Learn how to compare SHA-256 checksums before trusting a downloaded file, release archive, backup, or shared installer.
Read guidePopular Tools
Discover our most‑used developer tools
Base64 Encoder and Decoder Online | UTF-8 and URL-Safe Text
Encode or decode Base64 text with UTF-8 support and local-only processing.
QR Code Generator Online | URL, Wi-Fi, vCard, PNG and SVG
Generate static QR codes for URLs, Wi-Fi, contacts, and text as PNG or SVG.
Color Converter & Picker | HEX, RGB, HSL, HSV, CMYK
Convert colors between HEX, RGB, HSL, HSV, and CMYK with a live picker and copy-ready values.
Get Started Free
No install or sign-up. Everything runs locally in your browser for speed and privacy.
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