Where WebAssembly Gets Real

WASM I/O 2026 · 19 - 20 Mar · Barcelona

Wasm I/O is a two-day single-track conference focused on the WebAssembly ecosystem.
Join us in our fourth edition!

Be part of it!

The WASM
Conference
in Europe

Join the WebAssembly community from around the world for two days of deep technical sessions. There is no better place to share, discuss, collaborate and socialize with other WebAssembly professionals.

WASM I/O 2026 will take place in the beautiful city of Barcelona. Don’t miss the chance to join us and shape the future of WebAssembly!

2 days

19 - 20 Mar 2026

Barcelona

An unbeatable location

Call for papers

Our CFP is already closed.
We are currently reviewing all submissions and will publish the selected speakers / sessions soon.

Good luck everyone!

Check out the already selected talks here

View Selected Sessions

Secure
your ticket!

Early Bird
Conference Ticket WASM I/O 26
Early Bird
299 €
Until December 4th
All Things Webassembly
Get your Ticket Today
Barcelona
Mar • 19- 20 • 2026
2-Day Conference
AXA Convention Center
Standard
After 4th Dec
Standard
379 €
Until February 19th
All Things Webassembly
Get your Ticket Today
Barcelona
Mar • 19- 20 • 2026
2-Day Conference
AXA Convention Center
Late Bird
After 19th Feb
Late Bird
24 Feb 26 - 18 Mar 26

See what
you missed in 2025

Discover Barcelona

Wasm I/O will be held at the AXA Convention Center which part of an enormous complex located on the main artery of Barcelona. City communications are excellent and access from Barcelona’s Airport and Sants Station is very quick.

Barcelona is a city with a wide range of original leisure options that encourage you to visit time and time again. Overlooking the Mediterranean Sea, and famous for Gaudí and other Art Nouveau architecture, Barcelona is one of Europe’s trendiest cities.

Discover Barcelona