Comparison

Best Free File Converters Online 2026 (DOCX to PDF, MP4 to MP3)

July 3, 2026  ·  5 min read  ·  Fourmeld Blog

Need to convert a Word document to PDF, extract audio from a video, or change an image format? Free file converters make it easy — but many cap you at 2 files per day or demand a subscription. Here are the best that are truly free.

Supported formats to look for

DOCX → PDF
PDF → Word
MP4 → MP3
JPG → PNG
HEIC → JPG
MKV → MP4
WAV → MP3
XLSX → PDF
PNG → PDF
WebP → JPG

Top 5 Free File Converters (Ranked)

🥇 #1 — Best Overall

Fourmeld File Converter

Fourmeld converts 50+ file formats — documents (DOCX, XLSX, PPTX to PDF), images (JPG, PNG, WebP, HEIC), audio (MP3, WAV, FLAC, AAC) and video (MP4, MKV, AVI, MOV). No file limits, no watermark, no signup. Conversion happens server-side with fast processing.

Pros
  • 50+ supported formats
  • No daily limits
  • No signup required
  • No watermark
  • Documents, audio, video, images
  • Fast conversion
Cons
  • Max 500MB per file
Best for: anyone who needs to convert files frequently across multiple formats.
#2

Convertio

Convertio supports 300+ formats and is very well-known. The free plan allows 2 conversions per day with a 100MB file size limit. For more, you need a subscription from $9.99/month.

Pros
  • 300+ format support
  • Clean interface
  • Google Drive and Dropbox integration
Cons
  • Only 2 files/day free
  • 100MB file size limit
  • Paid for more usage
Best for: very occasional conversions when you only need 1-2 files.
#3

CloudConvert

CloudConvert supports 200+ formats with high quality output. Free plan gives 25 conversions per day. Quality is excellent — arguably the best for complex document conversions. Paid plans from $9.00/25 conversion credits.

Pros
  • Very high conversion quality
  • 200+ formats
  • 25 free conversions/day
Cons
  • 25 conversion daily limit
  • Slower free tier
  • Account required for more
Best for: high-quality document conversion when you don't need more than 25/day.
#4

Zamzar

Zamzar is one of the oldest file converters online. Free plan allows 5 conversions per day with a 150MB limit. Results are emailed to you rather than downloaded directly, which adds delay.

Pros
  • Wide format support
  • Simple interface
Cons
  • Results sent by email (slow)
  • 5 conversions/day limit
  • Dated interface
Best for: users who don't mind waiting for email delivery.
#5

FreeConvert

FreeConvert offers 1GB free file size and 25 daily conversions — generous free limits. Supports documents, images, audio and video. The interface has ads and is somewhat cluttered but functional.

Pros
  • 1GB file size limit (generous)
  • 25 daily conversions free
  • Many formats
Cons
  • Heavy ads on free plan
  • Cluttered UI
Best for: large file conversions where you need more than 100MB.

Verdict

For unlimited, no-signup, no-watermark file conversion — Fourmeld is the best choice. Convertio and CloudConvert have better format coverage but impose strict daily limits on free users. If you convert files regularly, those limits become frustrating fast.

Convert Files Free — 50+ Formats, No Limits

DOCX to PDF, MP4 to MP3, JPG to PNG and more — no signup, instant download.

Convert Files Free on Fourmeld →

Frequently Asked Questions

How do I convert DOCX to PDF for free?

Go to Fourmeld File Converter, upload your DOCX file, select PDF as the output format, and click Convert. Download your PDF instantly — no signup needed.

Which free file converter has no daily limit?

Fourmeld has no daily conversion limit and requires no account. Most other free converters cap you at 2-25 files per day.

Can I convert MP4 to MP3 for free?

Yes — Fourmeld supports MP4 to MP3 conversion. Upload your video file and download the audio as MP3.