What is the TIFF format?

1What is a TIFF file?

TIFF stands for Tagged Image File Format. Aldus developed it in the mid-1980s to unify the formats of the first scanners and desktop publishing programs. Its version 6.0, from 1992, became the reference, and today it is a de facto standard in professional photography, document digitization, graphic arts and cartography.

More than a single type of image, it is a very flexible container: it can store high-quality color photos, black-and-white documents, 16-bit images or even several pages in one file.

2How does TIFF's tag-based structure work?

A TIFF organizes information in a list of tags, each describing a property: dimensions, number of channels, compression type, resolution, orientation or where the data begins. This structure makes the format very extensible, but it also means there are variants that not every program interprets the same way.

A single file can include several images, called directories, which is why a multipage TIFF is common in document scans and faxes. The data can be uncompressed or compressed, lossless with LZW or PackBits, black and white with CCITT Group 3 and 4, or with JPEG.

3Advantages and limitations of TIFF

Advantages: lossless quality, 16 bits per channel, support for CMYK and color profiles, multiple pages, and wide acceptance in printing and archiving. Limitations: large file size, no browser support, variants with uneven compatibility, and a 4-gigabyte limit in classic TIFF, which the BigTIFF variant overcomes.

For these reasons, TIFF is excellent as a working or archive format, and awkward for distribution. To send or publish, it is best to convert it to a lighter format.

4TIFF vs. JPG, PNG and PDF

Compared with JPG, TIFF keeps all the quality but is much heavier. Compared with PNG, it offers CMYK, unrestricted 16-bit and multiple pages, although PNG is better for the web. Compared with PDF, TIFF is an image (or a set of them), while a PDF can mix text, vectors and images and opens in any viewer.

If you have a multipage TIFF that is a document scan, the usual route is to convert it to PDF to share it. With “Images to PDF” you get a manageable document, and with “OCR” you can make it searchable.

5Common problems with TIFF files

The most common is that a TIFF can't be opened or attached, because of its size or because the destination viewer or portal doesn't recognize it. The fix is to convert it to JPG for photos or to PNG or PDF for documents. “Compress image” and “Resize image” reduce the size when needed. There are also TIFFs with unusual compression that some programs can't read; a full-featured editor usually solves it.

Another detail: scanned TIFFs usually have a high resolution, 300 or 600 dpi, which makes them heavy. For on-screen use, a lower resolution is enough, and for regular text, 200 to 300 dpi is usually sufficient.

6Practical tips for TIFF

Keep the TIFF as the archive original, especially if it is a scan of an important document or a photograph you might need to print in large format, and create derived copies to share. If you turn on lossless LZW compression, you can save space without touching quality.

In Rayo PDF GO the conversions and compressions happen on your device, so scans with personal data, medical records or contracts are never uploaded to any server.

When digitizing documents, pick the resolution according to the final use. To keep a faithful copy of an important paper, 300 dpi in lossless TIFF is a reasonable standard; for office text that will only be read on screen, less is enough. More resolution doesn't improve a blurry original, it only adds file size.

7How to get the most out of TIFF in Rayo PDF GO

To share a scan, the most practical route is “Images to PDF,” which gathers the images into one document. Then, if you need to search the text inside, apply “OCR,” and if the file is large, “Compress PDF” reduces its size. For a single image, “Compress image” and “Resize image” get it ready for email or the web.

In the other direction, “PDF to images” lets you extract pages as high-quality images for printing or archiving. Always keep the original TIFF in a safe place and work with copies, so you don't repeat lossy conversions on your master file.