Written by Jennifer Walsh. Reviewed for technical accuracy by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion.
Shubham is an independent external reviewer and not an employee of PCDOTS.
Quick answer. Windows Paint and macOS Preview convert a JPG to TIFF free, and IrfanView or ImageMagick handle a whole folder at no cost. Worth knowing before you start, the change stops any further quality loss but cannot restore what the original JPG already discarded, and the file gets much larger.
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What the conversion cannot do?
Start here, because this is the part most guides get wrong, and getting it wrong leads to disappointment. Converting a JPG to TIFF will not make the image sharper, and it will not recover detail.
The reason is simple. JPG is a lossy format, and the moment your photo was first saved as a JPG it permanently threw away some of the picture to make the file small. Those details are gone from the file. TIFF is a lossless container, so it will hold whatever you put into it perfectly, but it has nothing to work with except the pixels the JPG still has. Convert and you get an image that looks exactly the same, artefacts and all, in a file several times the size.
That is not an argument against converting. It is an argument for converting for the right reason, which is what the next section is about.
Bigger, not better. The gain is what happens next, not what happened before.
When it is genuinely worth doing?
“A lossless format protects what it is given, it does not repair what arrived damaged, and those two things get confused constantly. Where the change earns its keep is at the start of a workflow, because a lossy file degrades a little more every time it is edited and saved again, while a lossless one does not. So the sensible moment to convert is before the editing begins, not after, and the honest description is that you are preventing future loss rather than undoing past loss.” Shubham Dixit, Data File reviewer (draft, pending approval)
There are three solid reasons to make this conversion, and one of them is much stronger than the rest.
The strong one is editing. Every time you open a JPG, change something and save it as a JPG again, it is recompressed and loses a little more. Do that five or six times and the damage is visible. Convert to TIFF before you start editing and that stops completely, because saving a TIFF costs nothing in quality no matter how many times you do it. This is the reason worth caring about.
The other two are practical. Sometimes a printer or publication simply requires TIFF, in which case the requirement decides it for you. And TIFF suits archiving, since it is openly documented, widely readable, and will not degrade with each save or re-save down the years.
Convert before you edit, not after. That is where the benefit actually is.
Convert JPG to TIFF free
For one image, both Windows and Mac already have what you need and neither costs anything.
On Windows, use Paint. Open the JPG in Paint, go to File then Save as, and choose TIFF. That is the whole job. Paint handles JPG perfectly well, and nothing is uploaded anywhere.
On Mac, use Preview. Open the image in Preview, choose File then Export, and select TIFF, where you can also pick the compression before saving.
Free ways to convert a whole folder
You will read that free tools cannot do batches. That is not accurate, and it is worth knowing before you buy anything.
IrfanView has had a batch conversion mode for years. Point it at a folder, set TIFF as the output format, choose a destination and run it. It is free for personal use, it is small, and for a straightforward folder of images it does exactly this job.
ImageMagick converts a directory from a single command, which suits anyone comfortable in a terminal. It can also combine a set of images into one multi page TIFF, which is genuinely useful for document work and is something most graphical tools will not do for you.
Online converters will do it too, and they are fine for something ordinary. The honest caution is that they upload your images to someone else’s server and some re-encode what you send, which is worth avoiding when the whole point was to stop the file degrading. For anything private or high volume, a local tool is the better call.
Expect a much bigger file
Plan for the storage, because the jump surprises people. JPG achieves its small size precisely by discarding detail, and TIFF does not do that, so the same photograph often lands somewhere between five and twenty times larger. A folder of holiday snaps can become tens of gigabytes without much effort.
The one setting that helps is compression. LZW and ZIP are lossless, so they shrink a TIFF substantially while keeping every pixel exactly as it was. Uncompressed TIFF gives you nothing extra in return for the space, so choose it only if some specific workflow insists on it.
Convert a folder with a converter
If a terminal is not for you and you would rather see the images before committing, a desktop converter covers the same ground through an interface. The PCDOTS Image Converter loads a folder of JPG files, previews them, and writes a TIFF for each in a single run on your own PC with nothing uploaded. That is its genuine strength here, a large batch handled offline without any command line. It carries the pixels across unchanged, which as above means the image is preserved rather than improved. There is a free version to try on your own files first.
The bulk route, for a folder of JPG files in a single run.
Here are the steps with the screens.
Step 1. Install and run the converter on your Windows PC.
Step 2. Click Open, choose JPG, and add your files or a whole folder, then preview them.
Step 3. Click Export and select TIFF from the list.
Step 4. Browse to a destination and click Save.
The same tool covers the neighbouring jobs, so there are guides to convert PSD to TIFF when the source is a Photoshop file, to convert PNG to TIFF, and to convert GIF to JPG going the other way.
The methods compared
Match the route to how many files you have.
| Method | Best for | Good to know |
|---|---|---|
| Paint or Preview | One image, free | Built in, nothing to install |
| IrfanView or ImageMagick | A folder, free | Real batch mode, multi page too |
| Batch converter | A folder, no command line | Previews first, runs offline |
Frequently asked questions
How do I convert JPG to TIFF for free?
On Windows, open the image in Paint and use Save as, then TIFF. On Mac, open it in Preview and use File then Export as TIFF. For a whole folder, IrfanView and ImageMagick both batch convert free.
Does converting JPG to TIFF improve the quality?
No. The detail a JPG discarded when it was first saved is gone permanently, and no conversion brings it back. What the change does is stop any further loss from future saves, which is why it is worth doing before editing rather than after.
Can I convert JPG to TIFF without losing quality?
Yes, in the sense that the conversion itself discards nothing, so the image you have is preserved exactly. The compression artefacts already baked into the JPG stay exactly as they are.
Why is my TIFF so much larger than the JPG?
Because JPG got small by throwing detail away and TIFF does not do that. Expect roughly five to twenty times the size, and use LZW compression, which is lossless and shrinks the file considerably.
Can free software batch convert JPG to TIFF?
Yes. IrfanView has a batch mode and ImageMagick converts an entire folder from one command, both at no cost. A paid converter is about convenience and previewing rather than being the only option.
How do I convert JPG to TIFF on Mac?
Open the JPG in Preview, choose File then Export, and pick TIFF. You can set the compression in the same dialog before saving.
The conversion cannot undo the first save
If you take one thing from this, make it the timing. Converting to TIFF is worth doing at the start of a job, before you edit, because from that point on nothing degrades no matter how often you save. Doing it afterwards to try to rescue an image that has already been through several rounds of JPG compression will only give you a much larger copy of the same picture. Same pixels, more disk space, no rescue.
