OmniCastCONVERTER
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Universal workbench

GFF3 to Genomic feature JSON

Create Genomic feature JSON from GFF3 locally, with no upload or account.

Device-onlyNo uploads. Ever.
Pipelines, branches, presets, naming, and detailed controls
Display
Quick start
Help me choose the best output Suggested: Genomic feature JSON

Recommendations use the registered target format and tested fidelity classification. They never inspect or upload your content.

01Input
Drop files or a folder hereChoose GFF3 files or a folder — batch input is welcome
or paste content
65 chars · 2 lines · 65 B
02Configure & run
GFF3Genomic feature JSON
structural conversion · single or batch
Conversion preflightSize, memory, engine, execution, and fidelity before you start
Input
65 B
Estimated peak memory
16 MiB
On-demand download
No large engine download
Execution
Responsive local worker
Fidelity
No lossy step declared
What to providePaste GFF3 content or drop a matching file.What you’ll getProduces previewable Genomic feature JSON text and a correctly named download.
Output naming & batch behavior
Exampleoutput.features.json
Pipeline 1 linear · 0 branches
Why use A → B → C?

A pipeline feeds each result directly into the next compatible converter. Use one when the destination needs an intermediate representation or when you want to inspect and normalize that middle format.

  • JSON → CSV → XLSX turns records into rows before building a workbook.
  • Markdown → HTML → DOCX resolves markup before creating a document.
  • SVG → PNG → PDF intentionally flattens vector artwork before placing it on a page.
Only type-compatible next steps are offered. Lossy steps are marked before you run them.
1GFF3 to Genomic feature JSONstructural
Parallel output branchesEach branch receives the final linear result. Branches do not feed or depend on one another.
Processing happens locally. Your file bytes are never sent anywhere.
About this conversion

How to convert GFF3 to Genomic feature JSON

Before you start

Paste GFF3 content or drop a matching file.

Accepted: .gff3, .gff · text/gff3
  1. Paste valid GFF3 content, choose files, or drag them onto the drop zone.
  2. Confirm the detected format. Mixed-format batches are flagged before conversion.
  3. Select “Convert on this device.” Produces previewable Genomic feature JSON text and a correctly named download.

How this converter behaves

Biological, molecular, genomic, matrix, and binary scientific metadata are parsed into bounded typed records and serialized locally without executing content.

What happens to your data?

The conversion engine runs in this browser tab. OmniCastConverter has no upload API and never sends your content, file name, or converted result to a server.

Fidelity and limitations

This route is classified as structural. The converter preserves meaning and structure supported by both formats.

  • Scientific records are validated and normalized, but domain-specific annotations and application conventions may require expert review.

Try a valid example

The “Use example” action in the workbench loads this exact input. Produces previewable Genomic feature JSON text and a correctly named download.

##gff-version 3
chr1	local	gene	1	120	.	+	.	ID=gene1;Name=Example