JPG to TIFF Converter

TIFF is the format printers, publishers, archives and many document systems ask for: lossless, with a recorded print resolution and room for several pages in one file. This converter turns JPG photos (and PNG or WebP images) into proper baseline TIFF files with LZW, Deflate or no compression, sets the DPI, and can put a whole set of pictures into one multi-page TIFF. It runs in your browser, so the images never leave your device.

How to use this tool

1. Choose one or more JPG images.
2. Pick the compression: LZW is the safe default; None gives the widest compatibility.
3. Keep the stored resolution or choose one, such as 300 DPI for print.
4. Tick "Combine" for one multi-page TIFF, then download the file or files.

Formula

File = 8-byte header ("II", 42, offset of the first IFD) + for each page an image file directory (ImageWidth, ImageLength, BitsPerSample 8,8,8, Compression, Photometric RGB, StripOffsets, RowsPerStrip, StripByteCounts, X/YResolution, ResolutionUnit inch …) + strips of about 64 KB.

With LZW or Deflate, each row is first stored as differences between neighbouring pixels (TIFF predictor 2), which makes photos compress better. LZW follows the same code rules as libtiff; Deflate uses the browser's zlib compressor. Multi-page files chain the directories and mark each one as a page with a page number.

Example

An uncompressed 160 × 100 px JPG becomes exactly 48,192 bytes: 8 bytes of header, a 162-byte directory with 13 tags, 22 bytes of tag values and 160 × 100 × 3 = 48,000 bytes of pixels. Two such images combined into one multi-page TIFF take 96,424 bytes, because each page gets two extra tags (page type and page number).