Zamzar – Free online converter that converts file online. Its free online file conversion offers file converting service covering a wide range of different image, document, music, video and compression formats. Free for files up to 100MB and more up to 1GB. The converted file will be sent to your email for download.

Zamzar converts various file format.

Also allows you to convert youtube videos for download in different format.

Free services allows you to convert file up to 100MB currently, larger conversion available for paid service.

Popular file conversion people are searching for are free online audio and video converter.
flv to avi that convert youtube videos for download, audio converter included wav to mp3, flv to mp3 and so on.

Most popular file conversion format for document:
pdf to doc
doc to pdf
pdf to docx
docx to pdf

You can use Zamzar online converter to convert your file included Image formats, Document formats, Music formats, Video formats and Other formats and also there are other popular free file conversion popular websites as below:

Image formats
bmp
gif
ico
jpg
pcx
png
tga
tiff
wbmp
wmf

Document formats
csv
doc
docx
html
odp
ods
odt
pcx
pdf
ppt
pptx
ps
pub
rtf
txt
wpd
wps
xls
xlsx
xml

Music formats
aac
ac3
flac
m4a
mmf
mp3
ogg
ra
ram
wav
wma

Video formats
3gp
3g2
avi
flv
gvi
iphone
ipod
m4v
mov
mp4
mpg
ogg
rm
rmvb
vob
wmv

Other formats
7z
tar.bz2
cab
lzh
rar
tar
tar.gz
yz1
zip

Besides, there are some other top free converter popular services available online you can use are listed below:

Media Convert – free and on line – convert and split sound
100% Free online file conversion no installation, no virus and spywares,convert video online, free online converter, media converter online
http://media-convert.com/

Online Conversion – Convert just about anything to anything else
Online Conversion is a resource for weights, measures, calculators, converters.
http://www.onlineconversion.com/

PDF Printer Driver, PDF Converter, Convert to Image, Free Online
High-performance PDF Converter, PDF Creator, PDF Printer Driver and various server-side PDF and image tools from Neevia Technology
http://convert.neevia.com/

Media Converter – the fastest free online audio and video converter
Convert your media files from your hard disk, by url/stream (http,ftp,mms,rtsp) or directly from Blip.tv, Break.com, Dailymotion, LiveVideo, MetaCafe
http://www.mediaconverter.org/

Movavi Online Video Converter
free online video converter!
http://online.movavi.com/

Doc2PDF Online: Document to PDF Conversion Service
Simply create a Free Online Email Account at Yahoo, Gmail, compiled from both of our work and your .pdf converter made a product that could view
https://www.pdfonline.com/convert_pdf.asp

Online PDF to HTML Conversion
Web form translating arbitrary PDF files to HTML, hosted by Adobe. Designed specifically to make PDF accessible to people with disabilities.
http://www.adobe.com/products/acrobat/access_onlinetools.html

Free Online PDF Creator – Convert files to PDF on the Web
Convert files to PDF with PrimoOnline, the free online PDF creator. Upload your files to the PrimoOnline web site and create PDF files
http://online.primopdf.com/

Create PDF Online Free, PDF Toolkit API for .NET, VB, Java, ASP
PDF Online allows you to quickly create PDF, find a site that claims they will convert your documents to PDF for Free
http://www.pdfonline.com/