Blog & guides
Guides for JSON escape/unescape, formatting, JWT, text, images, SEO, converters, and browser-first developer tools on Tools by RS.
- How to format JSON online (pretty-print & minify)
Format messy API JSON into readable indented output, or minify for transport - privately in your browser with Tools by RS.
2026-07-23 · 3 linked tools
- HTML email preview guide: Gmail, Outlook, dark mode, and responsive QA
Test HTML email in your browser with private previews for Gmail, Outlook, dark mode, and responsive widths. Step-by-step guide to Tools by RS email QA tools.
2026-08-28 · 5 linked tools
- Escape JSON Online - Escape, Unescape & Stringify Safely
Escape JSON online or unescape a JSON string in your browser. Convert JSON to an escaped string, parse escaped string to JSON - private, free, no upload.
2026-08-11 · 5 linked tools
- How to decode a JWT safely (without trusting claims)
Inspect JWT header and payload in your browser. Learn why decoding is not verification, and which claims matter when debugging auth.
2026-07-23 · 3 linked tools
- Base64 for developers: text, JSON, URLs, and what it is not
Learn when to Base64-encode text or JSON, how that differs from URL percent-encoding, and why Base64 is not encryption.
2026-07-23 · 4 linked tools
- Merge PDFs privately in your browser
Combine PDF files locally with Tools by RS - no upload required. Also cover split, rotate, and compress workflows.
2026-08-04 · 4 linked tools
- Private text tools for writers and developers
Convert case, count words, diff drafts, and slugify titles in your browser - without uploading manuscripts to a third-party site.
2026-08-07 · 5 linked tools
- Compress, resize, and convert images in your browser
A private image workflow: compress for email, resize for the web, convert PNG/JPG/WebP, and crop avatars - without uploading photos.
2026-08-07 · 4 linked tools
- SEO checklist before launch: meta, robots, SERP, OG
Generate meta tags, test robots.txt, preview SERP snippets, and debug Open Graph HTML locally before a page goes public.
2026-08-07 · 4 linked tools
- Convert JSON, YAML, and CSV locally
Move payloads between JSON, YAML, and CSV in your browser - private converters for APIs, configs, and spreadsheets.
2026-08-07 · 4 linked tools
- QR codes and color contrast in your browser
Generate QR codes, convert hex/RGB/HSL, and check WCAG contrast privately - no upload required.
2026-08-07 · 3 linked tools
- Download a QR code as PNG (free, in your browser)
Create and download a QR code PNG from a URL or short text on Tools by RS - optional transparent background, no upload.
2026-09-28 · 3 linked tools
- HTML escape and unescape online (browser-safe)
Encode text for HTML templates or decode entity strings from CMS and Power Automate output - privately on Tools by RS.
2026-09-28 · 4 linked tools
- JavaScript regex tester workflow (groups and flags)
Test RegExp patterns against sample text in the browser before shipping to production code on Tools by RS.
2026-09-28 · 3 linked tools
- Convert JSON to XML online (browser-private)
Use a JSON to XML converter in your browser on Tools by RS - validate JSON, convert to XML, and download without uploading payloads.
2026-09-28 · 4 linked tools
- Barcode generator online (Code128, EAN, UPC)
Create 1D barcode PNGs for SKUs and retail in your browser on Tools by RS - Code128, EAN, UPC, Code39, with clear guidance on when to use QR instead.
2026-09-28 · 2 linked tools
External blog
Additional long-form writing may appear on blog.rsroshi.dev. Prefer in-app guides when linking from tool pages so crawlers never hit soft 404s.