Format converter

Free

By AI Bookmarks Editorial Team, Directory editors Last reviewed 2026-10-26

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A free web converter for documents, images, video, audio and archives across 262 formats, with honest per-category size limits.

Quick facts

Pricing	Free
Free tier	Yes — no PRO tier, no per-file charge, no account
Platforms	Web, Android
Website	https://www.aconvert.com/

What Format converter is

Aconvert is an online file converter covering 262 formats across PDF, documents, ebooks, images, icons, video, audio, archives and web pages. Conversion runs on a pool of Windows and Linux servers, and when one fails the job is resubmitted elsewhere automatically, which is why a progress bar sometimes resets. Limits are published per category: 40 MB for documents, ebooks and archives, 200 MB for images, audio and video, and 1 GB for the video merger. Uploaded files are renamed to a random string, kept for one to two hours and deleted by a scheduled job, and the team states it offers no account signup, no REST API and no long-term storage, citing GDPR concerns. Batch conversion works without registering. A file analyser reports image geometry, video bitrate or audio sample rate when a file misbehaves. The site is free and funded by donations, with a companion Android app for offline conversion.

Best for

One-off conversions where installing a converter is overkill
Files up to 200 MB without creating an account
Batch jobs of a dozen files at a time

Not ideal for

Repeated or scripted conversion at volume, since there is no API
Confidential material that cannot sit on a third-party server

Pros

Very wide format coverage in one place, at no cost
Batch mode with no registration
Published per-category size limits, so expectations are set up front

Cons

No API, so it cannot be wired into a pipeline
Files sit on their servers for one to two hours before deletion
Busy servers fail and retry, so a large job takes as long as it takes

Pricing in detail

Free, with no pro tier and no per-file charge. The team funds its servers through donations and says plainly that the service is free rather than freemium: no size upgrade, no queue-jumping payment, no account. The trade-off is capacity. Conversion is spread across a pool of servers and jobs are retried when one is busy, so a large batch waits its turn. There is no paid support and no service-level agreement.