Guide

HEIC vs JPG: which image format should you actually use?

Apple's HEIC format promises smaller files with better quality, while JPEG remains the universal standard. The right choice depends on what you plan to do with your photos. Here is an honest comparison to help you decide.

Technical differences between HEIC and JPEG

JPEG (Joint Photographic Experts Group) has been the standard photo format since 1992. It uses discrete cosine transform (DCT) compression to reduce file sizes. At high quality settings, JPEG produces excellent results, but heavy compression introduces visible artifacts, especially around sharp edges and areas of solid color.

HEIC (High Efficiency Image Container) uses the HEVC (H.265) codec, which was originally developed for video compression. HEVC uses more sophisticated prediction and transform algorithms than JPEG's DCT, including variable block sizes and advanced intra-prediction. This allows HEIC to achieve roughly 50% smaller files at the same visual quality.

Beyond compression efficiency, HEIC supports features JPEG cannot match: 16-bit color depth (versus JPEG's 8-bit), alpha channel transparency, image sequences and bursts in a single file, and non-destructive editing metadata. HEIC also supports auxiliary image items like depth maps, which iPhones use for Portrait mode.

When JPEG is the better choice

JPEG remains the right choice whenever compatibility matters. Every device, browser, operating system, and application built in the last 30 years can open JPEG files. If you are sharing photos with others, uploading to a website, or sending files to a print service, JPEG virtually guarantees that the recipient can open your image.

JPEG is also better for professional workflows where you need to move files between different software tools. Adobe Creative Suite, GIMP, Figma, Canva, and virtually every image editor handles JPEG without issues. Some of these tools still have limited or no HEIC support.

For web publishing, JPEG (or the newer WebP format) is preferred because browsers universally support it. While Safari supports HEIC in webpages, Chrome, Firefox, and Edge do not, making JPEG the safer choice for web content.

When HEIC is the better choice

HEIC excels when storage space is a priority and you are staying within the Apple ecosystem. On an iPhone with 64GB or 128GB of storage, the 50% size reduction over JPEG can mean thousands of additional photos before running out of space.

HEIC is also superior for archival purposes within Apple's ecosystem. The 16-bit color depth preserves more tonal information than JPEG's 8-bit, which matters if you plan to do significant post-processing. The non-destructive editing metadata means you can undo edits even after saving.

If you shoot Live Photos, HEIC is the only format that stores both the still image and the short video clip in a single file. Converting to JPEG means losing the motion component entirely.

The practical approach: shoot HEIC, share JPEG

For most people, the best strategy is to keep your iPhone shooting in HEIC to save storage space and preserve maximum quality, then convert to JPEG when you need to share or use photos outside the Apple ecosystem.

File Studio makes this workflow seamless. When you need to share photos, simply drag them into File Studio, select JPEG as the output format, and convert. For regular workflows, set up a watch folder to automatically convert HEIC photos as they arrive on your Mac.

This way, you get the storage benefits of HEIC on your phone while ensuring your photos are universally accessible when they need to be shared. It is the best of both worlds without any compromise.

Compression efficiency: how HEIC achieves smaller files

JPEG's compression algorithm uses 8x8 pixel blocks, applying a discrete cosine transform to each block independently. This block-based approach is efficient but creates visible artifacts at low quality settings, particularly the blocky patterns that give JPEG compression its reputation. The algorithm was standardized in 1992 and has not fundamentally changed since.

HEIC's underlying HEVC codec operates on variable-size coding tree units (CTUs) up to 64x64 pixels, with sub-partitioning down to 4x4 blocks. This flexibility lets the encoder use large blocks for uniform areas (sky, solid backgrounds) and small blocks for detailed regions (foliage, text). HEVC also uses intra-prediction, where each block is predicted from neighboring already-decoded blocks, and only the prediction error is encoded. This redundancy removal is something JPEG cannot do.

In practical terms, a 12-megapixel iPhone photo at high quality occupies roughly 3-5 MB as JPEG and 1.5-2.5 MB as HEIC with equivalent visual fidelity. Over thousands of photos, this difference amounts to gigabytes of storage savings, which is why Apple made HEIC the default.

Feature differences beyond file size

HEIC supports 16-bit color depth per channel, compared to JPEG's 8-bit limit. This means HEIC can represent 65,536 shades per color channel versus JPEG's 256. For photography, this translates to smoother gradients, more accurate colors in shadows and highlights, and better preservation of detail in high-dynamic-range scenes.

HEIC natively supports transparency (alpha channels), which JPEG does not. It also supports non-destructive editing metadata, meaning tools like the iOS Photos app can store crop, filter, and adjustment data within the HEIC file without altering the original pixel data. Reverting to the original is always possible.

JPEG's advantages are entirely about compatibility. Every browser, operating system, image editor, printer, and digital display manufactured in the last 30 years supports JPEG. HEIC support is growing but remains inconsistent, especially on Windows, Linux, and older web browsers. For sharing and cross-platform workflows, JPEG remains the safer choice.

When to choose each format in practice

Choose HEIC for on-device storage when you are primarily using Apple devices. The storage savings are real, the quality is higher, and Apple's ecosystem handles HEIC seamlessly. Your iPhone, iPad, and recent Mac can all read, edit, and share HEIC files without conversion.

Choose JPEG when you need to share files outside the Apple ecosystem, upload to websites, attach to emails, or include in documents. JPEG is the universal language of digital images, and choosing it eliminates the possibility of a recipient saying they cannot open your file.

If you work in both worlds, the most practical approach is to shoot in HEIC for storage efficiency and convert to JPEG only when sharing externally. File Studio makes this conversion seamless, and with watch folders, it can happen automatically as part of your workflow.

How to do it with File Studio