HEIC Compressor Online

HEIC (High Efficiency Image Container) is the default photo format on iPhones and iPads running iOS 11 and later. Built on the HEVC (H.265) video codec, HEIC delivers roughly 50% smaller files than JPEG at equivalent visual quality, which is why Apple adopted it to save storage on devices. Despite its efficiency, HEIC has a compatibility problem: Windows, many web browsers, and most online tools cannot open HEIC files without plugins or conversion. This means iPhone users frequently need to either compress HEIC files to meet upload limits or convert them to JPEG for sharing on platforms that do not support HEIC natively.

Most online compressors force you to convert HEIC to JPEG before doing anything — SizeSnap skips that step entirely. The server-side pipeline decodes your HEIC file using libheif via the Sharp library, preserving the original color profile and orientation metadata. From there, SizeSnap runs the same binary-search quality algorithm it uses for JPEG: it iteratively adjusts the HEVC quality parameter, re-encoding at each step, until the file lands on your exact target size. If you prefer JPEG output for maximum compatibility, SizeSnap can transcode during compression — one upload, one result, no intermediate files. This native HEIC handling means zero quality loss from a preliminary format conversion that other tools require.

• 1If your goal is sharing on social media or email, set the output to JPEG — SizeSnap can compress and convert in a single step, saving you a separate conversion workflow.
• 2iPhone Live Photos save as HEIC by default. Before compressing, make sure you are uploading the still image file, not the associated video clip.
• 3HEIC files from modern iPhones are typically 2–4 MB. For email attachments, a target of 500 KB–1 MB usually preserves excellent quality.
• 4When uploading to platforms that reject HEIC (e.g. some government portals, older CMS tools), use SizeSnap to compress and convert to JPEG simultaneously.
• 5Keep your original HEIC files as archival copies — they offer the best quality-to-size ratio. Only compress or convert copies you plan to share.

Can I compress HEIC without converting to JPEG?

Yes! SizeSnap is one of the few online tools that handles HEIC natively — no conversion step needed.

Why can’t I open HEIC files on my computer?

HEIC is Apple’s default photo format. Windows and many web services don’t support it natively. SizeSnap can compress and optionally convert to JPEG in one step.

How do I share iPhone photos that are too large?

Upload your HEIC photo to SizeSnap, set a target size (e.g., 1MB for email), and download the compressed version. You can keep HEIC format or convert to JPEG for maximum compatibility.