Observed arrival · 2026-09-18
FormatOnce: File Tools That Stay in the Browser
A free browser-local toolkit for converting, compressing, validating, and repairing common image, audio, video, CSV, JSON, and SVG files.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People fixing files before upload or delivery
- Worth noticing
- CSV conversion preserves leading zeros and long IDs as text
Field notes
The toolkit keeps processing in the browser tab and offers format-specific controls rather than a single generic upload flow. Image tools can target a stated file size or maximum dimension, while data tools address delimiter, encoding, precision, and identifier handling. Audio conversion includes three listed MP3 bitrates, and the JXL converter is marked Beta with some variants unsupported. The page also states that clearing the page wipes its working state.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue