Popular tools
Popular developer tools on Tools by RS - curated from the registry (not fake trending). Private, browser-first utilities.
- 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.
- 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.
- Image CompressorPopularNew
Compress JPG, PNG, and WebP images in your browser with a quality slider - private, no upload.
- Image ConverterPopularNew
Convert images between PNG, JPG, and WebP in your browser - private, no upload.
- Meta Tag GeneratorPopularNew
Generate title, description, canonical, Open Graph, and Twitter meta tags as paste-ready HTML.
- 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.
- 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.
- PDF to JPGPopularNew
Render PDF pages to JPG 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.
- 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.
- 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.
- PDF to WordPopularNew
Extract PDF text into a simple DOCX. Layout is not preserved perfectly.
- Barcode GeneratorPopularNew
Generate Code128, EAN, UPC, and Code39 barcode PNGs 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.
- XML to JSONPopularNew
Convert XML to JSON privately in your browser.
- YAML to JSONPopularNew
Convert YAML to JSON privately in your browser.
- CSV to JSONPopularNew
Convert CSV to JSON privately in your browser.