VariantBench

Open a VCF file to see a summary, filter variants by type, quality, chromosome, or gene, and export the result. Files are read on your device and never uploaded.

Load variants

Choose VCF file

Accepts .vcf and gzip-compressed .vcf.gz files. SnpEff (ANN) and VEP (CSQ) annotations are read automatically.

Variants per chromosome

Variant types

Quality (QUAL)

Filter

Chromosome

Type

Impact

Min QUAL

Search (gene, ID, position)

Genotype of

PASS only Only variants this sample carries

Chrom	Position	ID	Ref	Alt	Type	QUAL	Filter	Gene	Effect	Genotype

About VariantBench

VariantBench is a free online tool for VCF variant analysis. Explore, filter, and export VCF variant files. It runs entirely in your browser, so there is nothing to install and your data stays on your device.

Features

VCF and gzip-compressed VCF
SnpEff ANN and VEP CSQ annotations
Ti/Tv ratio and variant type summary
Filter by gene, impact, QUAL, and genotype
Export filtered variants as VCF
Save results as text, spreadsheet, or sequence files
Installs on your phone and works offline

Common questions

Is my VCF uploaded to a server?

No. The file is read and processed entirely in your browser, which makes VariantBench suitable for sensitive data under your own policies.

Which annotations are supported?

SnpEff ANN and Ensembl VEP CSQ fields are parsed automatically to show gene, effect, and impact. Simple GENE= fields are also recognized.

How large a file can it open?

Files up to about 300 MB work in most modern browsers. For whole genomes, split by chromosome first, for example with bcftools view -r chr1.