Convert an image to another format, without uploading it
Pick the output format, drop in up to 20 files, and get them back as JPEG, PNG, WebP, AVIF, TIFF or BMP. Every file is decoded and re-encoded in your own browser, so none of them is ever sent to a server.
- No upload — runs in your browser
- Free, no account
- Reads JPEG, PNG, WebP, BMP, TIFF, AVIF, GIF — HEIC in Safari only
- Up to 20 files, 250 MB per batch
Output format
Every file is converted with the settings in force when it starts, so changing this also re-targets anything still waiting in the queue.
Opens everywhere
Modern, smaller files
Print and legacy
Drop images here or click to browse
Accepted: JPEG, PNG, WebP, BMP, TIFF, AVIF, GIF. HEIC only where your browser can decode it.
Up to 20 files, 250 MB in total
Your files stay on this device
Decoding, converting and zipping all happen in your browser. No image is uploaded, stored or sent anywhere.
How to convert an image format
Pick the output format
Choose JPEG, PNG, WebP, AVIF, TIFF or BMP before you add anything. Every file is converted with the settings that are in force when it starts.
Add your images
Drop in a whole folder of files or click to browse. Conversion starts straight away, two files at a time, and you can keep adding while it runs.
Download the results
Take the files one at a time, or the whole batch as a ZIP. Nothing was uploaded — every file was made on this device.
Which output format to choose
What each format keeps, what it throws away, and which of the four marketplaces this site checks accept it. Pick one and the converter takes it.
| Format | Transparency | Compression | Marketplace uploads | What it is for | Apply this format to the converter |
|---|---|---|---|---|---|
| JPEG.jpg | Flattened | Lossy | Amazon, Etsy, eBay, Google Merchant | Photographs and product shots. The smallest file every platform accepts, at the cost of a little detail on each save. | |
| PNG.png | Kept | Lossless | Amazon, Etsy, eBay, Google Merchant | Logos, screenshots and cut-outs with transparent edges. Every pixel survives, so the files are large. | |
| WebP.webp | Kept | Lossy | Google Merchant | Web pages and app assets. Usually a quarter to a third smaller than JPEG at the same quality, and it keeps transparency. | |
| AVIF.avif | Kept | Lossy | None of the four checked here | The smallest of the six at the same quality. Newer browsers only, and none of the four marketplaces checked here takes it yet. | |
| TIFF.tiff | Kept | Lossless | Amazon, eBay, Google Merchant | Print and archiving. Written uncompressed here, so expect very large files. | |
| BMP.bmp | Flattened | Lossless | eBay, Google Merchant | Uncompressed bitmaps for older Windows software. Almost always the largest option. |
JPEG
.jpgFlattenedPhotographs and product shots. The smallest file every platform accepts, at the cost of a little detail on each save.
- Compression
- Lossy
- Marketplace uploads
- Amazon, Etsy, eBay, Google Merchant
PNG
.pngKeptLogos, screenshots and cut-outs with transparent edges. Every pixel survives, so the files are large.
- Compression
- Lossless
- Marketplace uploads
- Amazon, Etsy, eBay, Google Merchant
WebP
.webpKeptWeb pages and app assets. Usually a quarter to a third smaller than JPEG at the same quality, and it keeps transparency.
- Compression
- Lossy
- Marketplace uploads
- Google Merchant
AVIF
.avifKeptThe smallest of the six at the same quality. Newer browsers only, and none of the four marketplaces checked here takes it yet.
- Compression
- Lossy
- Marketplace uploads
- None of the four checked here
TIFF
.tiffKeptPrint and archiving. Written uncompressed here, so expect very large files.
- Compression
- Lossless
- Marketplace uploads
- Amazon, eBay, Google Merchant
BMP
.bmpFlattenedUncompressed bitmaps for older Windows software. Almost always the largest option.
- Compression
- Lossless
- Marketplace uploads
- eBay, Google Merchant
What the format choice actually decides
Three questions settle it: how much detail you are willing to lose, whether the image has transparent pixels, and who has to be able to open the file.
LosslessLossy Lossy or lossless
JPEG, WebP and AVIF throw away detail to get small. PNG, TIFF and BMP keep every pixel and stay large. Re-saving a lossy file loses a little more each time.
Use lossy for photographs; use lossless for line art, screenshots and anything you will edit again.
Alpha keptFlattened Transparent pixels
PNG, WebP, AVIF and TIFF store an alpha channel. JPEG and BMP cannot, so transparent pixels are filled with the background colour from the settings panel.
Use a format that keeps alpha for cut-outs and soft edges; convert to JPEG only once you are happy with the background colour.
JPEGAVIF How far the file opens
JPEG and PNG open everywhere — every browser, every marketplace, every phone. WebP is close behind. AVIF is smaller still but newer, and marketplaces have not caught up.
Use a modern format on your own site; use JPEG or PNG for anything you hand to a marketplace or a customer.
Converting without losing what matters
A format change is not free. Going from PNG to JPEG throws away transparency and a little detail for good; going from JPEG to PNG keeps the detail that is already gone and makes the file several times bigger. Decide what the file is for first, then convert once.
Converting is not compressing. WebP and AVIF are smaller than JPEG at the same quality, but if you need a file to come in under a specific number of kilobytes, compress it to a target file size instead of guessing at the quality slider.
Converting never changes the pixel dimensions. A 6000 px photo is still 6000 px after it becomes a WebP, and most marketplaces cap the longest side — resize it first, then convert.
Metadata does not survive. EXIF, GPS coordinates, colour profiles and orientation tags are all dropped, because the image is redrawn on a canvas before it is re-encoded. That is good for privacy and bad if you were relying on a colour profile.
Limits worth knowing
- Reads JPEG, PNG, WebP, BMP, TIFF, AVIF, GIF, and HEIC only where the browser can decode it. Writes JPEG, PNG, WebP, AVIF, TIFF and BMP.
- Up to 20 files and 250 MB per batch, converted two at a time.
- Animated GIFs are converted from the first frame only, and multi-page TIFFs from the first page. The animation and the extra pages are not kept.
- AVIF can only be written where the browser supports it — Chrome, Edge and Opera today. HEIC and HEIF are read-only, and only where the browser can decode them.
Image format converter FAQ
Are my images uploaded to a server?
No. Every file is decoded, converted and zipped in your browser, and no image is uploaded, stored or sent anywhere. The page does fetch its own code as you go — the conversion worker when you add the first file, the ZIP library the first time you download a batch — but your pictures are never part of that.
Which formats can it read and write?
It reads JPEG, PNG, WebP, BMP, TIFF, AVIF, GIF. It also accepts HEIC, but only in a browser that ships a decoder for it — Safari on Apple hardware; anywhere else the file is reported as unreadable. It writes JPEG, PNG, WebP, AVIF, TIFF and BMP. HEIC and GIF are input-only, because no browser can write them.
How many images can I convert at once?
Up to 20 files per batch, 250 MB in total. Two are converted at a time so the tab stays responsive, and you can keep adding files while the batch runs.
Can I convert HEIC photos from my iPhone?
Only in a browser that can decode HEIC — Safari on an iPhone, iPad or Mac. Chrome, Edge and Firefox ship no HEIC decoder, so the file is reported as unreadable there rather than converted. On the phone, set Camera settings to Most Compatible, or share the photo as JPEG and convert that instead.
Does it convert TIFF files?
Yes. No browser decodes TIFF on its own, so the converter reads it with a built-in TIFF decoder and converts the first page. TIFF output is written uncompressed, so files written as TIFF are large.
Why does AVIF conversion fail in my browser?
Writing AVIF depends on the browser. Chrome, Edge and Opera can do it; Safari and Firefox cannot write AVIF from a canvas. The converter checks before it starts and tells you, rather than silently handing back a PNG named .avif. WebP is the closest alternative.
What happens to transparent areas when I convert to JPEG?
JPEG and BMP cannot store transparency, so transparent pixels are filled with the background colour from the settings panel — white unless you change it. Convert to PNG, WebP, AVIF or TIFF to keep the transparency.
What quality setting should I use?
85 suits most photographs. Use 90–95 for product shots and detail-heavy images, and 70–80 where file size matters more than the last few percent of detail. PNG, TIFF and BMP have no quality setting at all: they store every pixel, so the slider does not appear for them.
What to do next
- Compress ImageConverted and still too heavy? Compress it to a file size the platform will take.
- Resize ImageSet the pixel dimensions first, so the format change is the only thing that happens.
- Crop ImageTrim the frame or force a square before you convert it for a listing.
- Upscale ImageToo small once converted? Enlarge it without the edges going soft.
- Amazon Main Image CheckerCheck the converted file against Amazon's main image rules.
- Google Merchant Center Image CheckerCheck it against Google Merchant Center's image requirements.
Convert your images now
Pick a format, drop the files in, and download them back. Nothing leaves this device.