Does HEIC to JPG Convert Lose Quality?

Yes, converting HEIC to JPG loses a small amount of quality, and the file roughly doubles in size. At quality 90 and above the difference is very hard to see on an ordinary photograph. At quality 70 and below it becomes visible in skies, skin and other smooth areas.

Both formats are lossy, so the conversion decodes the High Efficiency Image Container (HEIC) file and encodes a new JPEG. That second encode discards a little detail from an image that was already imperfect. The loss is real and, for most purposes, unimportant.

How much quality is lost

At quality 90 the loss is invisible at normal viewing size and detectable only by comparing files pixel by pixel. The damage concentrates in specific places rather than spreading evenly across the picture.

• Smooth gradients such as a clear sky show faint banding first, where a gradual colour change becomes visible steps.
• Fine texture such as hair, fabric weave and foliage softens slightly.
• High contrast edges such as dark text on white can pick up a faint halo.
• Flat colour areas such as a painted wall stay clean at any reasonable quality.
• Overall colour and exposure do not change, since conversion affects detail rather than tone.

Why the file gets bigger

HEIC is roughly twice as efficient as JPEG, so the same photograph typically comes out about twice as large. The size change surprises people more than the quality change does.

The reason is age. JPEG was standardised in 1992 and its compression methods date from that decade. HEIC uses High Efficiency Video Coding (HEVC), designed 20 years later, which predicts pixel values far more cleverly and needs fewer bits to describe the same picture. A 2 MB HEIC file becoming a 4 MB JPEG is the expected result rather than a fault in the conversion.

Quality settings and what they cost

Use quality 90 for photographs you intend to keep, and quality 75 to 80 for anything heading to a website. The table shows what a typical 2 MB HEIC photograph becomes at each setting.

Quality 100 is worth avoiding. The setting roughly doubles the file against quality 90 while producing a difference no viewer can detect, because JPEG remains lossy even at its highest setting.

When the loss actually matters

The loss matters when the photograph will be edited heavily afterwards, printed large, or converted again later. For viewing, sharing and uploading, it does not matter at all.

Heavy editing is the clearest case. Raising shadows, pushing contrast or recovering a blown sky amplifies compression artefacts that were previously invisible, so an edit applied to a quality 75 JPEG produces worse results than the same edit applied to the HEIC original. Anyone planning to edit should keep the HEIC files and convert only the finished exports.

How to convert with the least loss

To keep as much detail as possible, follow these 5 rules.

1. Convert from the original HEIC file rather than from a copy that has already passed through a messaging app.
2. Set quality to 90 for anything you intend to keep, since the extra file size is cheap and the detail is not recoverable later.
3. Convert once. Each additional lossy save adds damage the next one cannot undo.
4. Resize before converting when the destination has a fixed display size, because resizing first means compression has less work to do.
5. Keep the HEIC originals until you have checked the converted files.

Avoiding the loss entirely

Convert to WebP or AVIF instead of JPEG when size matters more than universal compatibility. Both formats land close to the original HEIC file size, so the doubling problem disappears.

WebP is supported by every current browser and works well as a website format. AV1 Image File Format (AVIF) compresses harder still on large photographs and encodes more slowly. Neither format is accepted by government upload forms, and both remain unreliable in email, so JPEG stays the right answer whenever the destination is a form or an inbox.

What does not change during conversion

• Pixel dimensions stay the same unless you deliberately resize.
• Colour and exposure are unaffected, since compression works on detail rather than tone.
• EXIF metadata including the capture date is carried across when the converter preserves it.
• Orientation is preserved, so photographs taken sideways stay the right way up.
• Depth maps and Live Photo motion are lost, because JPEG has nowhere to store them.

Why repeated saving is the real danger

Lossy damage accumulates, so each additional save of a JPEG discards a little more detail permanently. A single conversion from HEIC costs almost nothing, while 5 rounds of opening and re-saving produce visible degradation.

The pattern appears most often with photographs shared repeatedly. A picture sent through a messaging app, saved, forwarded and saved again may pass through 4 or 5 encodes before anyone edits it. Working from the HEIC original each time avoids the whole problem, which is one practical reason to keep the originals rather than deleting them after a conversion.

Comparing 2 files honestly

Open both images at 100 percent zoom on the same screen and look at the same region, because thumbnails hide compression damage completely. Comparing at a reduced size shows nothing useful, since the reduction removes the detail under examination.

• Zoom to 100 percent rather than fitting the image to the window.
• Look at a smooth area such as sky or a plain wall, where banding shows first.
• Look at a high contrast edge, where halos appear before anything else changes.
• Switch between the 2 files in the same position rather than viewing them side by side.
• Judge on a normal screen, since a photograph inspected at 400 percent is not being viewed the way anyone will see it.

Does the conversion change dimensions or orientation

No, pixel dimensions and orientation are preserved unless you deliberately resize. A 3024 by 4032 HEIC photograph becomes a 3024 by 4032 JPEG, with the same crop and the same rotation.

Orientation deserves a brief mention because it fails occasionally with poor converters. Cameras record rotation as a metadata flag rather than by rotating the pixels, and a converter that drops the flag produces photographs lying on their side. Checking 3 or 4 portrait photographs after a large batch confirms the flag survived, and it takes less time than fixing hundreds of files later.

Is a converted JPEG good enough for printing

Yes, a quality 90 JPEG prints indistinguishably from the HEIC original at any normal print size. Print shops have accepted JPEG for decades, and most do not accept HEIC at all.

Resolution matters more than format for printing. A 12 megapixel photograph prints cleanly up to around A3 at 300 dots per inch, whatever format carries it. Convert at quality 90 or higher for print work, avoid resizing down first, and the compression loss will be far smaller than the differences introduced by the printer and the paper.

Converting a library without uploading it

Our converter runs entirely in your browser, so the decision about quality is yours and the photographs never leave your device. Up to 500 files convert in one batch, and a ZIP archive can be dropped straight in.

Set the quality once and every file in the batch is converted to the same standard, which keeps a family archive consistent. Because the work happens on your own processor, a large library converts at the speed of your computer rather than the speed of your connection, and nothing is stored on a server afterwards.