All tools
Browse every free browser-based developer tool - JSON formatter, validator, viewer, compare, Base64, JWT decode, UUID, hash, and more. Private, no upload.
All tools
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89 listed
- JSON FormatterPopular
Format, beautify, and minify JSON in your browser. Free, private, and instant - no upload to a server.
- JSON ValidatorPopular
Validate JSON instantly in your browser. See type, size, and node counts - or exact parse errors with line and column.
- JSON ViewerPopular
Explore JSON as an interactive tree with paths, types, and expandable nodes - all processed locally in your browser.
- JSON Compare
Compare two JSON documents structurally. Find added, removed, changed, and type-changed paths - privately in your browser.
- JSON Diff
Generate a unified diff of two JSON documents after pretty-printing. Ideal for reading line-level changes quickly.
- JSON Escape
Escape text into a JSON string literal, or unescape a JSON string back to raw text - instantly and offline.
- Base64 Encode / DecodePopularNew
Encode UTF-8 text to Base64 or decode Base64 back to text - instantly in your browser.
- URL Encode / DecodePopularNew
Percent-encode text for URLs or decode encoded query strings - private and instant.
- JWT DecodePopularNew
Decode JWT header and payload in your browser - inspect claims without uploading tokens.
- UUID GeneratorPopularNew
Generate UUID v4 identifiers in bulk - uppercase and hyphenless options, fully client-side.
- Regex TesterPopularNew
Test JavaScript regular expressions against sample text - matches and groups, private in your browser.
- Timestamp ConverterPopularNew
Convert Unix timestamps to dates and back - seconds, milliseconds, and ISO strings in your browser.
- Markdown PreviewPopularNew
Preview Markdown as HTML in your browser - private drafts, no upload.
- HTML Email PreviewPopularNew
Preview HTML email with estimated client compatibility - private sandbox, no upload.
- HTML EscapePopularNew
Escape and unescape HTML entities in your browser - private encode/decode, no upload.
- Hash GeneratorPopularNew
Generate SHA-1 / SHA-256 / SHA-384 / SHA-512 digests of text with Web Crypto - fully client-side.
- Case ConverterNew
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
- Word CounterNew
Count words, characters, sentences, and paragraphs with reading time - live and private.
- Text DiffNew
Compare two texts line by line - see added and removed lines with a unified-style diff.
- Slug GeneratorNew
Turn titles into clean, SEO-friendly URL slugs - lowercase, hyphenated, accents stripped.
- Lorem Ipsum GeneratorNew
Generate placeholder text by paragraphs, sentences, or words - deterministic and offline-friendly.
- Image CompressorPopularNew
Compress JPG, PNG, and WebP images in your browser with a quality slider - private, no upload.
- Image ResizerNew
Resize images by width or height in your browser - keep aspect ratio or stretch to exact pixels.
- Image ConverterPopularNew
Convert images between PNG, JPG, and WebP in your browser - private, no upload.
- Image CropperNew
Crop images by pixel coordinates in your browser - JPG, PNG, WebP, private, no upload.
- Meta Tag GeneratorPopularNew
Generate title, description, canonical, Open Graph, and Twitter meta tags as paste-ready HTML.
- Robots.txt TesterNew
Test whether a path is allowed by robots.txt for a user-agent - local Allow/Disallow matching.
- SERP PreviewNew
Preview title, URL, and meta description as a search snippet with character budgets - private and local.
- Open Graph DebuggerNew
Inspect Open Graph and Twitter Card tags from pasted HTML - find missing fields locally, no URL fetch.
- JSON Schema GeneratorPopularNew
Infer a draft-07 JSON Schema from sample JSON - local-first, private, optional rate-limited API.
- Regex ExplainerPopularNew
Explain JavaScript regex patterns - tokens, groups, and flags - privately in your browser.
- QR Code GeneratorPopularNew
Generate a PNG QR code from text or a URL - private, browser-only.
- Color ConverterNew
Convert between hex, RGB, and HSL color notations - private and client-side.
- Contrast CheckerNew
Check WCAG contrast ratio for foreground and background hex colors.
- Gradient GeneratorNew
Build linear and radial CSS gradients with Tailwind output - private and client-side.
- Merge PDFPopularNew
Combine multiple PDF files into one document entirely in your browser.
- Split PDFPopularNew
Extract a page range from a PDF into a new file in your browser.
- Rotate PDFPopularNew
Rotate PDF pages by 90°, 180°, or 270° entirely in your browser.
- Compress PDFPopularNew
Rewrite a PDF locally to shrink structural overhead. Results vary for image-heavy scans.
- Images to PDFPopularNew
Turn one or more JPG/PNG images into a PDF in your browser.
- JPG to PDFNew
Convert JPG/JPEG images to PDF locally in your browser.
- PNG to PDFNew
Convert PNG images to PDF locally in your browser.
- WEBP to PDFNew
Decode WEBP in the browser, then embed as PDF pages. Uses canvas conversion locally.
- PDF to JPGPopularNew
Render PDF pages to JPG images locally in your browser.
- PDF to PNGNew
Render PDF pages to PNG images locally in your browser.
- PDF to ImagesPopularNew
Render PDF pages to JPG or PNG images locally in your browser.
- PDF to TextPopularNew
Extract existing text from PDFs locally. Scanned PDFs need OCR PDF instead.
- OCR PDFNew
Run OCR on PDF pages locally with Tesseract. Slower and page-capped; best for short scans.
- Repair PDFNew
Rebuild a PDF by copying pages into a new document. Helps mild structural issues - not magic recovery.
- PDF to CSVNew
Extract PDF text and split lines into CSV heuristically. Best for simple layouts.
- PDF to ExcelPopularNew
Export PDF text to CSV for Excel. Heuristic tables - open the CSV in Excel or Sheets.
- Bank Statement PDF to ExcelPopularNew
Export bank statement PDF text to CSV for Excel. Heuristic - always review amounts.
- PDF Sign (local)New
Stamp a local signature name on the last PDF page. Not a full e-signature product.
- HTML to PDFPopularNew
Convert HTML to a simple text-layout PDF locally. Not a pixel-perfect print engine.
- DOCX to PDFPopularNew
Convert DOCX to PDF locally via HTML extraction. Complex layouts may lose fidelity.
- Word to PDFNew
Convert Word (DOCX) to PDF locally. Alias intent for DOCX to PDF with Word-focused copy.
- PDF to WordPopularNew
Extract PDF text into a simple DOCX. Layout is not preserved perfectly.
- Barcode GeneratorPopularNew
Generate Code128, EAN, UPC, and Code39 barcodes as PNG in your browser.
- JSON to XMLPopularNew
Convert JSON to XML privately in your browser.
- JSON to CSVPopularNew
Convert JSON to CSV privately in your browser.
- JSON to YAMLPopularNew
Convert JSON to YAML privately in your browser.
- JSON to TSVNew
Convert JSON to TSV privately in your browser.
- JSON to StringNew
Convert JSON to string privately in your browser.
- JSON to HTMLNew
Convert JSON to HTML privately in your browser.
- XML to JSONPopularNew
Convert XML to JSON privately in your browser.
- XML to CSVNew
Convert XML to CSV privately in your browser.
- XML to StringNew
Convert XML to string privately in your browser.
- XML to YAMLNew
Convert XML to YAML privately in your browser.
- RSS to JSONNew
Convert RSS/XML to JSON privately in your browser.
- YAML to JSONPopularNew
Convert YAML to JSON privately in your browser.
- YAML to XMLNew
Convert YAML to XML privately in your browser.
- YAML to CSVNew
Convert YAML to CSV privately in your browser.
- YAML to TSVNew
Convert YAML to TSV privately in your browser.
- CSV to JSONPopularNew
Convert CSV to JSON privately in your browser.
- CSV to XMLNew
Convert CSV to XML privately in your browser.
- CSV to YAMLNew
Convert CSV to YAML privately in your browser.
- CSV to HTMLNew
Convert CSV to HTML privately in your browser.
- TSV to JSONNew
Convert TSV to JSON privately in your browser.
- TSV to CSVNew
Convert TSV to CSV privately in your browser.
- String to JSONNew
Convert string to JSON privately in your browser.
- Base64 Encode TextNew
Encode plain text notes, messages, and Unicode strings to Base64 in your browser - private and instant.
- Base64 Encode JSONNew
Encode JSON payloads to Base64 for APIs, JWTs, and transport - decode back to UTF-8 JSON in your browser.
- Base64 Encode HTMLNew
Encode HTML fragments and markup to Base64 for data URLs, emails, and embeds - decode back in your browser.
- Base64 Encode URLNew
Encode URLs and query strings to Base64 for opaque links and redirects - distinct from percent-encoding.
- Gmail Email PreviewNew
Preview HTML email with Gmail-focused estimated compatibility checks - private browser sandbox.
- Outlook Email PreviewNew
Preview HTML email with Outlook-focused estimated warnings for Word-based rendering risks.
- Email Dark Mode TesterNew
Test HTML email dark-mode risks with light/dark preview chrome and color heuristics - private and client-side.
- Responsive Email TesterNew
Test HTML email at common device widths with estimated media-query guidance - private browser sandbox.
- HTML UnescapeNew
Decode HTML entities to plain text in your browser - named and numeric references, CMS and Power Automate friendly.