List Converter — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

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Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage — column to comma-separated

curl "https://list-converter-formatho.filesformatho.workers.dev/api?text=apple%0Abanana%0Acherry"

Newline lists become apple,banana,cherry in one call. Input delimiters are auto-detected (newline, comma, semicolon, tab, pipe or space).

Usage — comma list to JSON, deduped and sorted

curl "https://list-converter-formatho.filesformatho.workers.dev/api?text=b,a,a&to=json&dedupe=true&sort=asc"

Output modes: comma, newline, semicolon, tab, pipe, space, json, html (a <ul> list). Add quote=double, spacing=true, dedupe=ci (case-insensitive) or sort=length.

Full parameter reference: /api endpoint.

Privacy-first: conversion runs in-memory at the edge and is never logged or stored.

Full browser tool

Paste, click, copy with a full UI: List Converter on formatho.com.

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