Open GFF files in your browser
A genome's genes and their parts, as NCBI and Ensembl annotate them. Open a GFF right here as a row for each feature. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your features open as a row for each one, the first rows on show while the rest are read.
- A row for each feature • Place, length, strand and ID
- Sort and filter • Counts for every column
- Search • A gene by its name or ID
- Export • Save as CSV, Excel, JSON or Parquet
About GFF
GFF began at the Sanger Centre as a simple way for gene finders to share what they found, and GFF3, its version from the Sequence Ontology, is how NCBI, Ensembl and genome projects hand out a genome's annotation: every gene, transcript, exon and coding sequence and where it sits.
Each line is a feature in nine columns split by tabs: the sequence it's on, its source, its type, its start and end counted from 1, a score, its strand, its phase and attributes like ID=gene0001;Name=abcA;Parent=… that tie an exon to its mRNA and an mRNA to its gene. A ##FASTA section can follow with the sequences themselves.
Filepeek reads the file in pieces in your browser and shows each feature as a row with its place, length and strand, and its ID, name and parent taken out of its attributes, to sort, search and filter like any table. Show details gives its version and the sequences it covers, and Export saves the rows as CSV, Excel, JSON or Parquet.
General Feature Format
.gff • .gff3
Format
- MIME type
- text/x-gff3
- Made by
- Richard Durbin and David Haussler, then the Sequence Ontology for GFF3
Inside the file
- Each line
- A feature in nine columns
- Places
- Counted from 1, both ends in
- Attributes
- ID, Name and Parent, among others
- Markup
- Plain text
Opens in every browser
Filepeek opens GFF files of any size in Chrome, Edge, Firefox and Safari, read in pieces so the first features show at once. On their own, browsers download them or show them as text.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open GFF
- WindowsNo app built in reads it • IGV shows it on the genome
- MacNo app built in reads it • IGV shows it on the genome
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I find a gene in a GFF?
Search for its name or ID, or filter Type to gene. Each exon and CDS names its transcript in Parent, so filtering Parent to a transcript's ID lists its parts.
What's the difference between GFF3 and GTF?
They share nine columns. GTF names each feature's gene and transcript in every line, like gene_id "abcA";, and GFF3 ties features together with ID and Parent. Filepeek opens both.
Why does my GFF end with sequences?
A GFF3 can carry the sequences its features are on after a ##FASTA line, as Prokka writes them. Filepeek shows the features and says the sequences follow.