7 Best Free Image Format Converters in 2026
Converting between image formats should be simple. But some tools limit daily conversions, others upload your files to servers, and a few only handle a handful of formats. We tested seven converters to find which ones actually deliver.
All tools tested and pricing verified as of July 2026.
Quick Comparison Table
| Tool | Truly Free? | Local Processing | Formats | Quality Control | Resize | HEIF Input | Preview |
|---|---|---|---|---|---|---|---|
| MediaShed | ✅ Unlimited | ✅ Browser | 9 in / 4 out | ✅ Slider | ✅ Yes | ✅ Yes | ✅ Side-by-side |
| CloudConvert | ⚠️ 10/day | ❌ Server | 42 image formats | ✅ Yes | ✅ Yes | ✅ Yes | ❌ No |
| FreeConvert | ⚠️ With limits | ❌ Server | 30+ image formats | ✅ Yes | ✅ Yes | ✅ Yes | ❌ No |
| Convertio | ⚠️ 10 min/day | ❌ Server | 300+ total | ⚠️ Limited | ✅ Yes | ✅ Yes | ❌ No |
| toWebP.io | ✅ Unlimited | ✅ Browser | 7 in / WebP out | ❌ No | ❌ No | ❌ No | ❌ No |
| ezgif | ✅ Free | ❌ Server | 15+ image formats | ✅ Yes | ✅ Yes | ❌ No | ✅ Yes |
| Picflow | ✅ Unlimited | ✅ Browser | 8+ formats | ✅ Slider | ❌ No | ❌ No | ❌ No |
1. MediaShed — Best for Privacy and Quality Control
What it is: A browser-based format converter built on libvips (WebAssembly). Converts between 9 input formats and 4 output formats with quality slider and resize.
What’s good:
- Professional-grade engine (libvips — same library as Sharp and Cloudinary)
- Side-by-side preview before downloading
- Quality slider for lossy formats (JPG, WebP, AVIF)
- Resize with aspect ratio lock/unlock
- HEIF/HEIC input support (iPhone photos)
- Animated GIF to WebP conversion with frame preservation
- 100% browser-based — files never leave your device
- No limits, no account, no watermark
What’s not:
- 4 output formats only (PNG, JPG, WebP, AVIF)
- No API for automated conversion
- No non-image format support
- Requires ~8 MB initial engine download
Best for: Web developers, photographers, and designers who convert between common web formats and want quality control with privacy.
Try MediaShed Image Format Converter
2. CloudConvert — Best for Format Breadth and API
What it is: A universal file converter supporting 212 formats across 11 categories, with a full REST API.
What’s good:
- 42 image formats including niche types (DDS, ICO, PCX, TGA)
- Full REST API for production workflows
- Chained operations (convert + resize + watermark in one job)
- Non-image format support (docs, video, audio)
- High quality output with customizable settings
What’s not:
- Free tier limited to 10 conversions per day
- Server-side processing — files are uploaded
- Paid plans from $8/mo
- No preview before conversion
- Can be slow for large files (upload + process + download)
Best for: Developers needing API access. Users who convert between exotic formats or need non-image conversion.
3. FreeConvert — Best General-Purpose Free Converter
What it is: A web-based file converter with broad format support and a generous free tier.
What’s good:
- 30+ image formats
- Up to 1 GB file size on free tier
- Batch conversion
- Quality and resize options
- Simple, clean interface
What’s not:
- Server-side processing
- Free tier has usage limits (unclear exact caps)
- Ads on the free tier
- Slower than browser-based tools (upload/download overhead)
Best for: Occasional conversions between less common formats where file size limits on other tools are a problem.
4. Convertio — Best for Exotic Formats
What it is: A web converter supporting 300+ formats across all file types.
What’s good:
- 300+ total formats (images, docs, video, audio, archives)
- Google Drive and Dropbox integration
- OCR capability for scanned documents
- Good quality output
What’s not:
- Free tier limited to 10 conversion minutes per day
- 100 MB file size limit on free tier
- Server-side processing
- Paid plans from $9.99/mo for heavier use
- Ads on free tier
Best for: Users who need one tool for all file types, not just images.
5. toWebP.io — Best for Bulk WebP Conversion
What it is: A single-purpose browser tool for converting images to WebP format.
What’s good:
- 100% browser-based — no uploads
- Unlimited conversions
- Bulk processing
- Fast and simple
- No account required
What’s not:
- WebP output only — can’t convert to PNG, JPG, or AVIF
- No quality slider
- No resize
- No HEIF/HEIC support
- No preview
Best for: Developers who need to batch convert a folder of PNGs or JPGs to WebP for web performance.
6. ezgif — Best for GIF and Animation Work
What it is: A web-based tool suite focused on GIF editing and conversion, with broader image format support.
What’s good:
- Strong animated format support (GIF, WebP, APNG)
- GIF creation from video
- GIF optimization and editing tools
- Free with no account required
- Adjustable quality settings
What’s not:
- Server-side processing
- Ad-supported (heavy ad placement)
- 50 MB file size limit
- Interface feels dated
- No HEIF/HEIC support
Best for: Anyone working with animated GIFs — creating, editing, optimizing, or converting them.
7. Picflow — Best Minimal Browser Converter
What it is: A simple browser-based image converter with a clean interface.
What’s good:
- 100% browser-based
- Quality slider for lossy formats
- Clean, fast interface
- No account required
- Free and unlimited
What’s not:
- Limited format support compared to server-based tools
- No resize during conversion
- No HEIF/HEIC support
- No batch processing
- No animated format support
Best for: Quick, simple format conversions between common web formats in a clean interface.
Key Considerations
Browser-Based vs Server-Based
Three of these tools (MediaShed, toWebP.io, Picflow) process files entirely in your browser. The rest upload files to servers. The practical differences:
- Browser-based: Instant processing, complete privacy, works offline, no file size limits (within RAM). But limited to formats the browser engine supports.
- Server-based: Broader format support, can handle very large files, but slower (upload + process + download), privacy dependent on provider’s retention policy.
HEIF/HEIC Support
If you work with iPhone photos, HEIF input support matters. MediaShed, CloudConvert, FreeConvert, and Convertio handle HEIF. The others don’t.
Output Format Coverage
MediaShed outputs PNG, JPG, WebP, and AVIF — the four formats that matter for web. CloudConvert and Convertio offer dozens more output formats for specialized needs.
Summary: Which Tool Should You Use?
| Your situation | Best tool |
|---|---|
| Common web formats + privacy + quality control | MediaShed |
| API access or exotic formats | CloudConvert |
| Large files, occasional use | FreeConvert |
| All file types (docs, video, audio too) | Convertio |
| Bulk PNG/JPG to WebP | toWebP.io |
| GIF and animation work | ezgif |
| Simple, fast, browser-based | Picflow |
Try MediaShed Image Format Converter — convert between PNG, JPG, WebP, AVIF, HEIF and more in your browser. Read our guide on how to convert image formats.