HEIC is the default photo format on every modern iPhone and iPad, designed for smaller file sizes and better color fidelity than JPG, but it is poorly supported by older operating systems and many cloud services that expect JPG or PNG.
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HEIC (High Efficiency Image Container) is a container format defined by the ISO/IEC 23008-12 standard, holding image data compressed using the HEVC codec (the same codec used for H.265 video). Apple adopted HEIC as the default photo format on iPhone in iOS 11 (2017) because it produces files roughly half the size of equivalent JPGs at the same visual quality. The tradeoff is compatibility: HEIC requires a HEVC decoder, which is licensed under patent pools and not universally available, so older Windows machines, older Android devices, and many web services cannot read HEIC files natively. The standard workaround is to convert HEIC to JPG before sharing, but this adds a step and recompresses the image data through lossy JPG, often visibly degrading quality.
FixTools handles HEIC natively in the browser using a WebAssembly HEVC decoder that runs locally on your CPU. When you drop a HEIC photo onto the tool, the decoder reads the file, extracts the HEVC bitstream and image properties from the ISO BMFF container, decodes the bitstream into a raw RGB pixel buffer, and embeds that buffer into the PDF as a FlateDecode (lossless) image stream. The whole pipeline runs locally with no network activity, which you can verify in browser developer tools. The output PDF works on any device with any PDF reader because PDF compatibility is universal, unlike HEIC compatibility which is patchy.
Quality preservation is the key benefit of going direct from HEIC to PDF rather than via JPG. A HEIC source carries roughly the same visual information as the equivalent original JPG would, but stored more efficiently. Converting HEIC to JPG first introduces lossy DCT recompression that throws away high-frequency detail and adds blocking artifacts at quality levels below 85. Going HEIC to PDF through FixTools embeds the decoded pixel data losslessly, preserving the original image fidelity inside the PDF. The PDF is larger than the source HEIC (because PDF embedding is less compressed than HEVC), but the visual quality is the best possible result for any HEIC source.
For the common iPhone workflow of "I took some photos and need them in a PDF", FixTools eliminates the friction of converting through Files or Photos first. Open Safari on the iPhone, navigate to FixTools, tap the upload zone, pick photos from the library, and the tool produces a downloadable PDF directly on the device. The PDF can be saved to Files, shared via AirDrop, or emailed from the same Safari session. The whole conversion happens locally on the iPhone CPU using the iOS built-in HEVC hardware decoder accessed through the WebKit canvas API, taking under a second per photo even on older iPhones.
Drop iPhone HEIC photos onto FixTools. The tool decodes them and produces a PDF directly, with no intermediate JPG step.
Step-by-step guide to heic to pdf converter:
Export HEIC from iPhone
On iPhone, photos are HEIC by default. AirDrop to Mac preserves HEIC; AirDrop to PC may convert to JPG depending on the receiving software. For best results, AirDrop or save HEIC originals directly to a Mac, iPad, or to a cloud drive accessible from your computer. Alternatively, open FixTools directly on the iPhone in Safari and skip the transfer step.
Open FixTools in your browser
Navigate to the FixTools Image to PDF page. The page loads in any modern browser including mobile Safari and mobile Chrome. No install, no extension, no sign up.
Drop or pick the HEIC files
Drag HEIC files onto the upload area on desktop, or tap the upload zone on mobile to pick photos from the iOS or Android photo library. The tool detects the HEIC format from the file's ftyp box and routes it to the HEVC decoder.
Convert to PDF
Click Convert. The HEVC decoder runs in browser memory, decoded pixels are embedded losslessly into the PDF, and the result downloads in seconds. The PDF opens in any reader on any platform.
Common situations where this approach makes a real difference:
iPhone user sending photos to a Windows recipient
An iPhone user needs to send eight HEIC photos of a damaged delivery to the seller, who uses a Windows 10 machine that cannot read HEIC natively. They open FixTools on the iPhone in Safari, pick the eight photos from the library, convert them to a single PDF, and email it via the same Safari session. The seller opens the PDF in Edge with one click and sees all eight photos at full quality, no HEIC compatibility errors.
Landlord submitting iPhone photos to a council portal
A landlord needs to upload twelve HEIC photos of a rental property condition to a council portal that only accepts PDF. The portal would reject HEIC outright. FixTools converts the twelve photos to a single PDF in under thirty seconds, the PDF is uploaded to the portal, and the application moves forward without any of the photos passing through a server-side HEIC converter that might log the addresses.
Realtor packaging iPhone listing photos as a PDF
A realtor takes twenty HEIC listing photos on their iPhone during a property visit. They want to send a single PDF to potential buyers via email, with one photo per page. FixTools handles the HEIC decode natively, produces a clean twenty page PDF on the iPhone via Safari, and the realtor emails it from the same device. No laptop, no conversion app, no quality loss from going through JPG.
Student submitting iPhone scans of handwritten notes
A student photographs a stack of handwritten notes with their iPhone in HEIC format. They need to upload a PDF to their learning management system before midnight. FixTools converts the eighteen HEIC photos to a single PDF in their browser in under thirty seconds, the upload succeeds, and the student submits before the deadline without ever needing to leave the iPhone or use a third-party scanner app.
Get better results with these expert suggestions:
Keep HEIC originals rather than converting to JPG first
Each conversion step can lose quality. Converting HEIC to JPG and then JPG to PDF goes through one lossy step that you can avoid by going HEIC straight to PDF. FixTools embeds the decoded HEIC pixels losslessly into the PDF, preserving every bit of fidelity the HEIC source captured.
Disable HEIC capture in iPhone settings only if you must
On iPhone, Settings > Camera > Formats > Most Compatible switches photo capture to JPG. This is useful if your downstream workflow universally rejects HEIC, but HEIC is generally preferable for file size and quality. With FixTools handling HEIC directly, there is little reason to switch the iPhone setting away from High Efficiency.
AirDrop HEIC originals to Mac for the cleanest workflow
AirDrop between Apple devices preserves the HEIC bytestream. Send HEIC originals to your Mac, then drop them into FixTools in Safari or Chrome on the Mac for desktop-speed conversion. AirDrop to PC may auto-convert to JPG depending on the receiving software.
Note that HEIC PDFs are larger than HEIC sources
PDF embedding is less compressed than HEVC, so the output PDF is typically two to three times the source HEIC file size. A 2 MB HEIC produces a roughly 5 MB PDF. If file size matters, run the PDF through the FixTools PDF Compressor after conversion to bring it back closer to the original HEIC size.
More use-case guides for the same tool:
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