Convert PNG to TIFF
Lossless in, lossless out: PNG graphics, scans and screenshots turned into TIFF on your own device.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Convert PNG images to lossless TIFF with transparency kept, for print, publishing, OCR and archive systems. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
PNG and TIFF are both lossless, so this is one of the few conversions where nothing about the picture changes. People need it because a system on the other end reads TIFF only: journal and thesis submission portals that want figures as TIFF, print and sign shops, archival and records systems, scanning and OCR software, and GIS or scientific tools that treat TIFF as their native image type.
Every pixel of the PNG is copied into the TIFF exactly, at the same size, as 8-bit red, green, blue and alpha. Transparent areas stay transparent: the TIFF’s alpha channel is written as unassociated (straight) alpha, which Photoshop, GIMP, Affinity and most publishing software read correctly. Some older viewers ignore TIFF alpha and show transparent areas as black or white; the pixels underneath are unchanged either way.
The TIFF is uncompressed. PNG compresses losslessly, so the TIFF is usually several times larger: 4 bytes per pixel, around 8 MB for a 1920 × 1080 screenshot. That is expected, and it is the most compatible form of TIFF, since every TIFF reader supports uncompressed strips.
The resolution tag is set to 72 pixels per inch. For print, what counts is the pixel size; a publisher who needs 300 or 600 dpi figures checks that the pixel dimensions are large enough and changes the tag in their layout software. PNG text chunks and colour profiles are not copied over.
Charts and diagrams exported from Excel, matplotlib, R or PowerPoint as PNG are the most common reason for this conversion, since many journals list TIFF as the figure format. Export the PNG at the size the journal asks for (their guidelines give a width in pixels or inches at a given dpi), then convert it here; line art and text stay exactly as crisp as in the PNG.
How it works
- Drop your PNG files onto the page, or tap to pick them. Batches are fine.
- Nothing to set: every TIFF is written uncompressed at full resolution, with an alpha channel.
- Download each TIFF, or all of them as one zip.
In your browser, not on a server
Stayput first reads the opening bytes of each file, where every image format writes its signature, so it knows what the file really is whatever it is called. Your browser decodes JPG, PNG, WebP, GIF, BMP, AVIF and SVG itself; TIFF goes through UTIF.js, HEIC through the libheif WebAssembly decoder, and JPEG XL (or AVIF, in a browser without native support) through the Squoosh decoders, all served from this site and cached. The browser re-encodes JPG, PNG and WebP; PDF, ICO, GIF, BMP and TIFF files are written by small encoders in the page. Nothing here needs a server.
Compared with upload-based tools: Online converters upload your image, convert it on their machine, keep it for hours and cap you at a few files a day. This does the same conversion on your device, for as many files as your device’s memory can hold, with no upload to wait for.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Is PNG to TIFF lossless?
Yes. Both formats are lossless, and every pixel, including its transparency, is copied unchanged.
Does the TIFF keep my transparent background?
Yes, as an alpha channel. Editors such as Photoshop, GIMP and Affinity show it as transparency. A few basic viewers ignore TIFF alpha and show a solid background instead, but the transparency is still in the file.
Why is the TIFF bigger than the PNG?
The TIFF is stored uncompressed for maximum compatibility, while PNG compresses without loss. Expect three to ten times the size, depending on the image.
Can I make a TIFF from a screenshot for OCR or fax software?
Yes. Screenshots and scanned pages saved as PNG convert without any loss, so text edges stay sharp for OCR. Fax and document systems that need black-and-white Group 4 TIFFs are the exception; this page writes colour TIFFs only.
My publisher wants 300 dpi. Is this TIFF usable?
The dpi tag here says 72, but that is only a label. If your image has enough pixels for the printed size (for example 2100 pixels wide for 7 inches at 300 dpi), the publisher can relabel it without resampling.
Is anything uploaded?
No. The PNG is decoded and the TIFF is written in this browser tab. Your files are not uploaded.
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