Best Free File Converter in 2026: 7 Picks Compared

Search for the best free file converter and you'll find dozens of sites that look almost identical: a big upload box, a format dropdown and a promise that it's free. The differences only show up once you've uploaded a file. That's when you discover a daily limit, a size cap, a watermark or a nudge towards a paid plan.

We looked at seven popular options, both online converters and desktop apps, and compared them on what matters day to day: how many formats they handle, what the free tier actually allows, how they treat your files, and how quickly you get from upload to download.

A note on bias: we make RunConvert, and it's on this list. We've tried to be fair. Free-tier limits change often, so we quote each service's own published figures at the time of writing and link you to check them. If a number matters to you, confirm it on the service's pricing page before you rely on it.

What We Compared

• Format range. Can it handle documents, images, video, audio, ebooks and archives, or just one category?
• Free limits. The maximum file size, the daily allowance, and whether you need an account.
• Output quality. Watermarks, forced re-encoding, and whether settings are available.
• Privacy. Encryption, automatic deletion and where processing happens.
• Convenience. Batch conversion, speed, and whether it works on any device.

1. RunConvert: Best All-Round Free Online Converter

Best for: people who convert all kinds of files and don't want to sign up for anything.

RunConvert handles more than 3,000 conversions across 11 categories: documents, images, video, audio, ebooks, spreadsheets, presentations, archives, vector graphics, fonts and CAD files. You don't need an account, nothing is watermarked, and files up to 1 GB are accepted. Uploads travel over an encrypted connection, are processed in isolated containers and are deleted automatically after conversion.

There's a free daily allowance, which goes up if you create a free account. Settings like MP3 bitrate, video quality and trimming sit behind a settings button, so they don't get in the way of quick jobs.

Downsides: heavy daily users will eventually hit the free allowance. Like any online tool, it needs an internet connection and an upload.

Popular tools: PDF to Word, HEIC to JPG, MP4 to MP3, MOV to MP4.

2. CloudConvert: Polished, With a Strong API

Best for: developers and power users who want fine-grained options.

CloudConvert has been around for years, supports a broad range of formats and exposes detailed conversion options. It's also popular as an API for automated workflows. Free use is metered: the free plan comes with a small daily allowance of conversions, and larger or more frequent jobs need credits or a subscription. Check its pricing page for current numbers.

Downsides: the free allowance runs out quickly if you batch-convert.

3. FreeConvert: Generous Settings, Metered by Minutes

Best for: occasional conversions where you want to tweak settings.

FreeConvert covers documents, images, video and audio and offers a wide set of options per conversion. Its free plan is measured in conversion minutes per day rather than file count. Its pricing page lists 20 conversion minutes a day for free users at the time of writing.

Downsides: long videos eat into the minute allowance fast, and the interface carries ads.

4. Convertio: Simple Interface, Daily Credits

Best for: quick one-off conversions from your computer or cloud storage.

Convertio's clean interface lets you pull files from Google Drive or Dropbox. Its support documentation describes a free tier of daily conversion credits, with larger allowances on paid plans.

Downsides: the daily credits limit batch work, and terms differ between the website and the API.

5. Zamzar: Long-Standing, but Tight Free Limits

Best for: the occasional single file.

Zamzar is one of the oldest online converters and supports a wide range of formats. Its free use is limited to a couple of files in a 24-hour window, within per-format size limits. Zamzar publishes these on its size limits page.

Downsides: the free limits are tight, so it's not practical for more than a file or two a day.

6. HandBrake: Best Free Desktop Video Converter

Best for: converting and compressing lots of video on your own computer.

HandBrake is free, open-source software for Windows, Mac and Linux. It converts almost any video into MP4, MKV or WebM, with presets for phones, web and devices, and quality controls that professionals rely on. It runs locally, so there are no upload or daily limits.

Downsides: it's video only, it needs installing, and its settings can overwhelm beginners. Speed depends on your own hardware.

7. LibreOffice: Best Free Desktop Document Converter

Best for: batch-converting office documents offline.

LibreOffice is a free office suite that opens and saves Word, Excel and PowerPoint files and exports to PDF. Its command-line mode can batch-convert whole folders of documents, which IT teams love.

Downsides: documents only, a big install, and complex layouts don't always survive the round trip perfectly.

Side-by-Side Summary

So Which Is the Best Free File Converter?

It depends on what you convert and how often:

• Mixed files, a few times a week, no sign-ups: an all-round online converter like RunConvert.
• Automated workflows: a converter with a mature API, such as CloudConvert or RunConvert's API.
• Hours of video every week: install HandBrake.
• Folders of office documents offline: LibreOffice.

Whatever you choose, use the same quick checklist: no watermark, a file size cap that fits your files, automatic deletion of uploads, and no installer pretending to be a web tool. Our guide to choosing a free online file converter goes through each point in more detail.