Compress XZ online

Smaller XZ files, same XZ format—server-side processing.

Drag & drop files here or browse. Max file size 100 MB for your account. Sign up or view pricing.

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Compression results

How your files are processed

Files are uploaded and processed on our servers, then made available for download.

What this tool does

XZ archives absorb huge folders of text, JSON, CSV, or XML—formats DEFLATE and friends can shrink dramatically.

Smaller XZ packages mean faster rsync jobs, cheaper object storage, and fewer bounced email attachments.

Choose a level that balances wait time against ratio, then upload the allowed source.

Lossless packing — XZ archives preserve member bytes; only container encoding changes.
Benchmark levels — Top presets rarely beat mid tiers by double-digit percent—time one corpus overnight before you lock automation on those values.
Entropy limits — Encrypted or media-heavy members resist shrinkage regardless of codec choice.

How to compress XZ files?

Choose file — select a XZ file that matches this compressor (allowed extensions apply).
Adjust options — set quality, level, or advanced options if shown, then compress.
Download — grab the smaller file from your job page when processing completes.

Why compress XZ files?

Archives are lossless: extracted bytes match the originals. Savings come from squeezing redundant structure inside members—already compressed or encrypted payloads resist further shrinkage.

Common uses for XZ compression

Ship XZ archives after tuning codec level for long-term storage versus quick sharing.
Upload XZ bundles to object storage when egress charges punish large prefixes.
Reduce XZ backup payloads before copying them to removable media.
Batch XZ logs for SIEM ingestion without raw multi-gigabyte uploads.
Archive XZ releases that must round-trip bit-identical for compliance.
Pack XZ trees before syncing them across metered cellular uplinks.

Will compressing XZ (XZ) affect quality?

Archive compression is lossless for stored payloads: extracted files match the originals bit-for-bit.

The only “quality” question is whether nested media were already lossy before archiving—compression does not repair or degrade those inner files.

How XZ archive compression works

What is inside the archive

Archives store file bytes plus metadata. Repetitive text or structured data compress well; encrypted or already-packed payloads resist shrinkage.

What this profile changes

Single-file compressors squeeze one stream—ideal for logs or static assets—rather than whole folder trees.

Numeric presets flatten past level 12 on mixed trees—profile one sample repack before you schedule month-long batch jobs.

Troubleshooting

Archives may not shrink much when they contain already-compressed files (JPEG, MP4, encrypted payloads).
Large archives take longer and may exceed limits: split the archive or remove unneeded files.
Compression level trade-off: higher levels take longer for small extra savings.
Encrypted archives often compress poorly: encryption removes redundancy.

XZ compression FAQ

Encrypted blobs or already-packed members resist further compression. Structural gains appear when redundancy exists inside stored bytes.

Yes—lossless archive codecs preserve bytes exactly. If a member changes after packing, hashes differ because the source changed.

Start near the default. Move up for long-term storage; move down for frequent repacks that need fast turnaround.

Each compressor profile targets one allowed extension list. Split mixed folders into matching jobs or preprocess odd files separately.