How to convert PNG to TIFF without uploading it
Every "free" online PNG converter you've used uploads your images to a company server, converts them there, and — in several documented cases — keeps a copy or a live download link for hours. For personal photos, client work and anything you wouldn't post publicly, that's an unnecessary risk. The safer approach is to convert the file where it already is: on your own device.
This tool does exactly that. When you drop a PNG here, your browser:
- Decodes the PNG natively — every modern browser includes a PNG decoder, so there is no decoder file to download and no waiting for a library to load. Animated PNGs (APNG) decode to their first frame only.
- Flattens any transparency onto the background colour you chose (white by default, or black), because the TIFF written here stores 8-bit RGB with no alpha channel. The file card warns you when this happens.
- Re-encodes the pixels as a TIFF with a pure-JavaScript TIFF encoder — little-endian header, one IFD per image, LZW, Deflate, PackBits or no compression, and the DPI you chose written as XResolution and YResolution tags. Your original file is never modified.
What makes this converter different
The converters that top the results for this search mostly upload your files to a server (XConvert does offer a compression choice — LZW, DEFLATE, PackBits, ZSTD or none — in a batch with a ZIP download, but only after your files upload), and the client-side ones we found are thin — ForgeConvert converts client-side in a batch of 20 but offers LZW only, with no other compression choice, no DPI tags and no multi-page mode, filevolve converts locally in a batch but states no compression choice, no DPI tags and no multi-page mode, and Imagen AI converts client-side but only uncompressed, with no compression choice, no DPI tags and no multi-page mode. This page is the only fully client-side dedicated PNG-to-TIFF page we found that combines a batch of 20 files with a ZIP download, a genuine compression choice (LZW by default, Deflate, PackBits or uncompressed), DPI tags from 72 to 600, a multi-page TIFF combine mode, per-file previews, and a choice of background colour for transparency, with no daily limits, no account, no watermark and no paywall. It runs entirely in your browser — there is no server to upload to, no daily limits, no account and no watermark.
When is TIFF the right choice for a PNG?
When the destination demands it: print shops and scanning bureaus that ask for TIFF, archives that store images losslessly, and layout software (InDesign, QuarkXPress and their peers) that places TIFFs at a stated DPI. TIFF is also the format for multi-page scans — one file, one page per image. For anything else — sharing, web, storage — keep the PNG or use PNG to JPG instead and keep the smaller file.
Files are checked by their contents, not their name: a PNG saved as .txt still converts, because the PNG signature (89 50 4E 47 0D 0A 1A 0A) is what matters, while a JPG renamed to .png is refused with a pointer to the matching converter. A corrupt PNG is refused at validation, and a truncated PNG — one whose chunks run past the end of the file before the final IEND chunk — is refused with a per-file error explaining what happened.
Honest limitations
No quality recovery
PNG is already lossless — it throws away no detail when it saves. A TIFF holds the same decoded pixels, losslessly — it cannot add detail that was never there. Converting only stops further loss and fits pipelines that demand TIFF.
TIFFs are usually larger than PNGs
PNG is already compressed, so the TIFF cannot shrink the pixels further — expect roughly 3× the size for an uncompressed TIFF of a photo, less with LZW or Deflate. A 300-DPI A4 scan is about 26 MB uncompressed. Every file shows its size multiple honestly, and the batch bar shows the total before you download anything.
8-bit RGB only, alpha flattened
Output is 8-bit RGB — no 16-bit, no CMYK, no alpha channel. A 16-bit PNG is converted to 8-bit by the browser canvas path, and PNG transparency is flattened onto the background colour you choose (white by default, or black).
Animated PNG: first frame only
TIFF has no animation, so an animated PNG becomes a still TIFF of its first frame. The file card warns you instead of silently dropping the animation.
Multi-page TIFFs are not universal
Multi-page TIFFs open in most viewers, but some old software shows only the first page. If the destination is old or unknown, send one TIFF per file instead.
DPI is only a tag
The DPI you pick never changes the pixels — it only records how large the image prints. A 72-DPI tag on a 4000-pixel photo still prints large; the pixels are what they are.
Metadata is stripped
Camera metadata (EXIF, including location) is dropped on re-encode. Orientation is applied where the browser exposes it, so the output is stored upright. There is no text layer, no OCR, and nothing searchable is added.