Convert GFF / GTF / BED to Markdown.
Drop a GFF, GTF or BED file and get the main annotation columns as a clean Markdown table. It runs entirely in your browser, so your file never leaves your device.
Drag & drop your files
or
Optimize for AI & RAG
Extra cleanup for LLM ingestion: strip HTML, fix smart quotes, tidy Unicode and spacing.
Add YAML front matter
Prepend a metadata block (title, source, date, word & token counts) for knowledge bases and RAG.
Add table of contents
Build a linked index from the headings. Handy for long documents.
Export RAG chunks (.json)
Split the result into retrieval-ready chunks. Download per file from the result panel.
Most converters quietly upload your documents to a server. This one physically can't.
Tab columns,
hard to scan.
GFF, GTF and BED pack one feature per line across tab-separated columns that are tough to read by eye. Converting lines the main columns up in a readable Markdown table.
##gff-version 3
chr1 havana gene 1000 9000 . + . ID=gene1
chr1 havana mRNA 1000 9000 . + . ID=mrna1
# Genomic annotations (GFF/GTF)
- **Entries:** 2
| Sequence | Source | Type | Start | End |
| --- | --- | --- | --- | --- |
| chr1 | havana | gene | 1000 | 9000 |
| chr1 | havana | mRNA | 1000 | 9000 |
Everything you
actually need.
Genome annotations in, a clean Markdown table out, with no server and no account anywhere.
It never leaves your browser
Your .gff, .gtf or .bed is read and parsed on your own device. Nothing is uploaded to any server, ever.
# Heading
- point one
3 chunks
AI & RAG ready
Optional cleanup, YAML front matter, a table of contents and RAG chunk export.
Works offline
Once the page has loaded you can switch off your connection and it keeps converting.
Features become a table
The main columns of each annotation row line up in one table, for up to 200 entries.
Unicode safe
Accents, symbols and non-Latin scripts come through intact as UTF-8.
Free, and unlimited
No sign-up, no quotas, no watermarks. Convert one annotation file or a thousand; it all runs the same way, on your own device.
What survives
the trip.
Honest about what comes through, and what doesn't. These are the same notes the Formats list shows for GFF, GTF and BED, so the page never drifts from what the converter really does.
Kept
2- An entry count
- A table of the main columns (up to 200 entries)
Dropped
3- The attributes column
- Extra columns
- Rows beyond 200
Annotation questions,
answered.
Everything worth knowing before you drop in a GFF, GTF or BED file.
Other converters.
Working with more than annotation files? These convert the same way: privately, in your browser.
Environment to Markdown
.env
Environment variable files.
KDL to Markdown
.kdl
KDL document language.
LDIF to Markdown
.ldif
LDAP directory records.
OpenAPI / Swagger to Markdown
.json · .yaml
REST API specifications.
RAML to Markdown
.raml
RESTful API modeling language.
API Blueprint to Markdown
.apib
API Blueprint specifications.
WSDL to Markdown
.wsdl
SOAP web-service definitions.
WADL to Markdown
.wadl
REST service descriptions.