Can it handle multi-sheet workbooks?

ODS (OpenDocument Spreadsheet) is the native spreadsheet format for LibreOffice Calc and Apache OpenOffice Calc, standardized under ISO/IEC 26300. Like its sibling ODT, the file is a ZIP archive holding content.xml with cell data, formulas, and chart definitions plus embedded objects. It's the mandated spreadsheet format in jurisdictions requiring open standards (German BSI, French RGI, Brazilian e-PING) and is the default save format in LibreOffice Calc on every Linux distribution shipping with the suite preinstalled - Ubuntu, Fedora, openSUSE, Debian, Mint.

Converting ODS to HEIC renders each sheet (tab) as one HEIC image at the sheet's print-area dimensions - typically A4 or Letter page size - at roughly half the bytes a JPG render would need. Cells, formulas (as evaluated values), conditional formatting, alternating row colors, embedded charts, and pivot tables all render as they appear in Calc's print preview. Tab order is preserved; sheet 1 becomes image 1 of the output, sheet 2 becomes image 2, and so on. Charts created via Calc's chart wizard render cleanly because LibreOffice rasterizes them internally during the headless conversion, and HEIC's 10-bit color keeps chart gradient fills smooth.

The compact per-sheet images work best inside Apple-centric workflows - an accountant filing balance-sheet snapshots into Photos on a Mac, a Linux-using freelancer AirDrop-ready invoice previews for an iPhone-carrying client, or a compliance archive where dozens of quarterly workbooks are stored as images with minimal footprint. Remember that HEIC needs Apple hardware or the Windows HEVC extensions to open, and chat platforms like Slack won't preview it - convert onward via HEIC to JPG for those audiences. For editable handoff to Excel use Calc's File > Save As > .xlsx. To bundle sheet images into a single document see HEIC-to-PDF.

Reasons to convert ODS to HEIC usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts HEIC uploads.
• You need a feature unique to HEIC (e.g. transparency, vector scaling, animation, multi-page pages, etc.) that ODS doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the ODS → HEIC tool on heic.now.
2. Drag your ODS file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to HEIC. If the format supports extra options (page size, transparency background, quality, EXIF stripping), tweak them in the right-hand panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical photos.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• Set a deliberate print area in Calc (Format > Print Ranges > Define) before converting - otherwise the image includes the entire used cell range, often with awkward empty rows.
• Charts render at the resolution of the chart object on screen - resize them larger in Calc before exporting for sharper axis labels in the output.
• Conditional formatting (color scales, data bars, icon sets) renders correctly because Calc applies it before rasterization.
• Hide gridlines via Tools > Options > LibreOffice Calc > View if you want a cleaner image for client-facing reports.
• For pivot tables with collapsed groups, the output captures the current collapse state - expand or collapse to taste before converting.