Convert TIFF to JPG on iPhone Without an App

TIFF files arrive from three places and never from anywhere else. A scanner made one. A printer or a designer sent you one. Or an institution, a hospital, a land registry, a university archive, emailed you something scanned in 2004 and never updated their pipeline.

The file opens fine when you tap it on your iPhone, which makes the next part confusing. You try to upload it to a form, or attach it somewhere, or post it, and whatever you are using refuses to accept it. The image is perfectly good. The container is thirty years old and half the modern web has never been taught to read it.

What TIFF is, and why it refuses to die

TIFF stands for Tagged Image File Format. It dates to the late 1980s and it was designed for exactly the jobs it still does: scanning, prepress and archiving. Three properties keep it alive.

• It is usually lossless. No compression artefacts, ever, which matters when the image is a legal document or a medical scan and detail cannot be invented or discarded.
• It can hold multiple pages in one file. A twelve page scanned contract can be a single TIFF. Almost no other image format does this.
• It handles CMYK and colour profiles properly, which is why print workflows never let go of it.

The cost of all that is size. A TIFF of a scanned A4 page can be tens of megabytes where the equivalent JPG is a few hundred kilobytes. That is the trade you are making when you convert, and it is usually the right trade.

Check it opens before you do anything else

Tap the file in the Files app. iOS previews TIFF natively, so if it displays correctly, the image data is healthy and every method below will work on it. If you get a grey box, the download was truncated or the file uses an unusual compression variant, and the fix is to get a fresh copy rather than to try harder with a converter.

While you are there, long press and choose Get Info to see the file size. That number tells you whether you are dealing with a single page scan or something much larger.

The two tap route, from the share sheet

iOS puts a share icon on every file in the system, which makes the share sheet the right place for a converter to live. That is the whole design idea behind Grabio.

1. Open Files and find the TIFF.
2. Tap the share icon.
3. Scroll to Grabio in the action list.
4. Pick the JPG tool.
5. Save the result to Files or to Photos.

Grabio is a free iOS Shortcut. No App Store install, no account, no paid tier at any point. If it does not appear in the share sheet the first time, scroll to the bottom of the list, tap Edit Actions, and pin it so it stays near the top.

The honest caveat is the same for every on-device tool: it works with formats iOS itself can decode. TIFF is one of those, which is why the preview works. A file using an exotic compression scheme that iOS cannot read will fail here too, and that is a desktop job.

Building it yourself in Shortcuts

If you would rather install nothing, Apple’s Shortcuts app does a plain conversion in two actions.

1. Open Shortcuts, tap the plus button.
2. Add Convert Image and set the format to JPEG.
3. Add Save File or Save to Photo Album.
4. In the shortcut’s settings, turn on Show in Share Sheet.
5. Name it and tap Done.

The Convert Image action includes a quality slider, worth pulling down if the goal is a smaller file. The drawback of the do it yourself route is that you end up building one shortcut per format and per task, which is the sprawl I got tired of before writing Grabio. Converting any file format on iPhone covers the general approach either way.

The multi-page trap

This is the thing that catches people, and no article seems to mention it. If your TIFF holds several scanned pages, converting it to JPG gives you one image. JPG has no concept of pages, so the converter takes the first one and the rest quietly do not come along.

If you convert a scanned contract and get page one, that is what happened. It is not a broken tool.

The right target for a multi-page document is PDF, which handles pages properly and which every institution on earth accepts. Grabio has a To PDF tool for this. Related walkthroughs that cover the same territory from other directions: turning a photo into a PDF, combining several images into one PDF, and going the other way with converting a PDF back into images.

If the pages started as paper, honestly the better move is to skip the TIFF entirely and rescan with the iPhone camera, which produces a clean multi-page PDF in one pass. That is covered in scanning a document to PDF on iPhone.

Colour, and why print TIFFs can look wrong afterwards

TIFFs from a print workflow are often CMYK, the four ink colour model used by presses. JPG is an RGB format, made for screens. Converting one to the other means a colour space change, and colours can shift, particularly deep blues and rich blacks.

For a reference copy or an email attachment this does not matter. If the file is going to a printer and the colours have to be right, do not convert it, send the TIFF. Losing the CMYK data to make the upload easier is exactly the wrong trade in that situation.

The size drop, and how far to take it

Converting a lossless TIFF into a JPG is usually a very large reduction. That is the point. Where people go wrong is compressing further than they need, which starts costing visible quality in scanned text, where compression artefacts around letter edges make documents harder to read and harder for OCR to handle.

Convert once, check it, and only compress more if something is still rejecting it. If a form is what is rejecting it, the limit is often about dimensions rather than bytes, which I go through in fixing a photo that is too big for an online form and resizing to exact dimensions.

Getting set up

TIFF is not a format you meet daily, which is exactly why it is annoying when you do. Having a converter already sitting in the share sheet turns it from a twenty minute detour into two taps. Get the Shortcut.

It is free, there is no login, and it handles the other formats you meet more often too, including the Apple ones like HEIC that cause the same trouble in the opposite direction.

Frequently asked questions

Can an iPhone open TIFF files?

Yes. iOS previews TIFF natively in the Files app and in Mail, so tapping one shows the image. The problem is downstream, where upload forms, websites and other apps often reject the format. That is why converting to JPG is usually about compatibility rather than about viewing.

Why is my TIFF file so large?

Because TIFF is typically stored losslessly, keeping every pixel exactly as scanned rather than throwing anything away. That is deliberate for archival and print work. Converting to JPG applies lossy compression and usually cuts the size dramatically.

What happens to a multi-page TIFF when I convert it to JPG?

You get the first page only, because JPG cannot hold multiple pages. Convert to PDF instead if the document has more than one page. If the source is paper, rescanning with the iPhone camera produces a proper multi-page PDF in one go.

Will converting TIFF to JPG lose quality?

Yes, since JPG is lossy and TIFF usually is not. At normal quality settings the loss is invisible for photographs and acceptable for documents. Scanned text suffers most, because compression artefacts collect around letter edges and make OCR less accurate.

Is there a free way to convert TIFF on iPhone?

Two of them. Apple’s Shortcuts app has a Convert Image action you can build into a share sheet shortcut, and Grabio is a free Shortcut with a JPG tool ready to go. Neither requires an App Store install, an account, or any payment.

Should I convert a print-ready TIFF to JPG?

Generally no. Print files are often CMYK with specific colour profiles, and JPG is an RGB format, so the conversion shifts colours in ways a press will reproduce faithfully and unhelpfully. Send the original TIFF to anyone who is actually going to print it.