ComprimirPDF is a free Spanish PDF compression tool that reduces PDF file size directly in the browser. Users can select a PDF, choose a compression level, and download the result without registration. The product emphasizes local processing and privacy: the document stays on the user's device instead of being uploaded to the site's servers.
Who it is for
People and small teams who need to shrink PDF files quickly, especially Spanish-speaking users who prefer not to upload documents to unknown servers.
Problem it solves
PDF files are often too large to send by email or upload to forms, and most online compressors ask you to upload the document to their servers first. That means waiting for an upload, handing a private file to a third party, and sometimes hitting a file size limit or a paywall.
The solution
Open the page, select a PDF, choose a compression level and download the smaller file. Everything runs in the browser, so there is nothing to install, no account to create and no document to upload. It is free and works on both desktop and mobile browsers.
What makes it unique
The compression happens locally on the user's device instead of on a remote server, so the PDF never leaves the browser. That combination — local processing, no registration and a free tool in Spanish — is what separates it from the upload-first compressors.
Features3 listed
Compress PDFs directly in your browser
Pick a PDF and shrink it without installing anything or creating an account.
Your file never leaves your device
Processing happens locally in the browser, so the document is not uploaded to external servers.
Choose the compression level you need
Select how much to compress and download the result right away.
Details
Platforms
Web
Pricing
Free
Built for
People and small teams who need to shrink PDF files quickly, especially Spanish-speaking users who prefer not to upload documents to unknown servers.
In IndieTools' mobile lab test on November 12, 2026, the ComprimirPDF website scored 97 out of 100 (good). Largest Contentful Paint took 980 ms, rated good. It placed #528 overall in the finalized week 2026-W45.
Measured (UTC)
LCPLargest Contentful Paint
980 ms
Good
TBTTotal Blocking Time
60 ms
Good
CLSCumulative Layout Shift
0.001
Good
FCPFirst Contentful Paint
980 ms
Good
Ranked #528 overall in 2026-W45, best #149.
ComprimirPDF lab metrics
Speed metrics for ComprimirPDF, measured November 12, 2026
Metric
Result
Status
Trend
Mobile lab testMid-range phone on a throttled 4G connection, two runs averaged. Changes compare with the run on Nov 11.
Performance score
GoodAbout the same
97 / 100
GoodAbout the same
First Contentful PaintFCP
GoodAbout the same
980 ms
GoodAbout the same
Largest Contentful PaintLCP
GoodAbout the same
980 ms
GoodAbout the same
Speed IndexSI
Needs improvement382 ms slower
4.74 s
Needs improvement382 ms slower
Total Blocking TimeTBT
GoodAbout the same
60 ms
GoodAbout the same
Cumulative Layout ShiftCLS
GoodAbout the same
0.001
GoodAbout the same
Unthrottled observationsTimed on the test machine's own fast connection, so they read lower than the lab metrics above.
Page loadLoad
258 ms slower
3.31 s
258 ms slower
Server responseTTFB
About the same
5 ms
About the same
ComprimirPDF performance history
55 comparable mobile lab runs since September 27, 2026. Choose a metric and a range, then move along the line to read each run.
ComprimirPDF Speed ranking
Weekly Speed standing for ComprimirPDF
Weekly standingLatest finalized week 2026-W45. Bests cover the last 52 finalized weeks.
Stored lab observations from controlled test runs, not real-user Core Web Vitals or a guarantee of search rankings. Weekly standings remain attached to their finalized edition.Method psi-mobile-two-sample-mean-v1, 2 samples per reading. Lab results can vary between runs.
Model difference+10. DR4 is 10 points higher than DR3.
Measured · comprimirpdf.app
What do DR4, DR3 and the model difference mean?
DR4:
Ahrefs' newer model. It gives more weight to links from sites with organic search traffic and rates a subdomain on its own links.
DR3:
The previous model, shown in the Ahrefs app until 1 December 2026.
Model difference:
DR4 minus DR3 for the same domain. The models calculate differently, so this is not growth or a drop; the “since” lines compare each model with itself.
Toolsped is a free online library of 600+ calculators, converters and everyday tools — from mortgage and finance calculators to unit converters — that run instantly in the browser with no sign-up.
