Siftlet

Practical browser utilities

Siftlet

Small tools.
Clear receipts.

Use the tool, then keep the result. Local file processing, clear limits, and phone-ready save or share.

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Live collection57 working tools

Useful now.

No account wall. No mystery upload. These are the newest and most-used jobs; the searchable bench holds all 57 tools.

37

Graph maker

Paste spreadsheet data or open CSV and TSV files, then make bar, line, area, pie, donut, or scatter charts with SVG, PNG, PDF, and data export.

39

Schema generator

Generate and validate local JSON-LD for organizations, products, articles, events, videos, breadcrumbs, software, people, websites, and local businesses.

38

Robots.txt tester

Build or paste a robots.txt file, validate crawler groups and sitemaps, then test the exact Allow or Disallow rule for any bot and path.

36

U.S. passport photo

Crop an original portrait to the official U.S. 2 × 2-inch guide, then export a 600 × 600 JPEG or exact-size print sheet.

34

PDF page numbers

Add page numbers to a chosen PDF range, start at any number, filter odd or even pages, and optionally stamp a text watermark.

35

CSV merger

Combine CSV or TSV files by stacking aligned rows or joining records on a shared ID, email, SKU, or other key.

Browse all 57 tools
Trust is easier when the tool leaves a receipt.
  1. Processing. We say whether a file or value leaves your tab.
  2. Export. Phone users get the native share sheet; desktop users get a file download.
  3. Tests. We publish the behavior we check before release.

347

Open-source field index

Useful projects, checked before listing.

We traced direct GitHub links from the Chinese Independent Developer list, checked repository availability and root licenses, and kept the raw directory out of search results.

Browse the research catalog