Best Free Image Converters (Compared)
An honest comparison of free image converters — including where FormatFlash fits.
There are many free image converters, but they differ a lot in privacy, formats, limits and how they earn money. This comparison focuses on what actually varies between them.
FormatFlash is included, but so are the alternatives — the goal is to help you pick the right tool, not to oversell.
At a glance
| Tool | Processing | Account | Price | Best for |
|---|---|---|---|---|
| FormatFlash | In your browser (no upload) | No | Free | Private conversion, HEIC, PDF/text, offline |
| Squoosh | In your browser | No | Free | Fine-grained lossy compression |
| iLoveIMG | Server (upload) | No* | Free tier + paid | Broad image editing |
| TinyPNG | Server (upload) | No | Free tier + paid | Quick PNG/JPG compression |
| Convertio | Server (upload) | No* | Free tier + paid | Many file types, including media |
How to choose
- Prioritise privacy? Choose a client-side tool (FormatFlash, Squoosh).
- Need advanced editing or many formats? A server tool may fit.
- Need HEIC from an iPhone? FormatFlash decodes it locally.
- Need PDF or text tools too? FormatFlash covers those as well.
Why local processing matters
When a converter uploads your file, a copy leaves your device and lands on infrastructure you do not control. Client-side tools avoid that entirely — you can watch the network tab and see there is no upload.
Frequently asked questions
What is the best free image converter?
It depends on your priorities. For privacy and no upload, a client-side tool like FormatFlash or Squoosh is best; for broad editing, server-based tools offer more features.
Are free converters safe?
Client-side tools are safest for private images because files are not uploaded. With server tools, check the privacy policy and retention.
Can I convert HEIC for free?
Yes — FormatFlash converts HEIC to JPG, PNG or WebP locally and free.
Try it
Try the free, no-upload image converter now.