How does one pick stocks to invest in? One great way is to find a knowledgeable and talented investment advisor such as those we have here at Investing Daily. You just can’t find better investment talent than Investing Daily‘s team of fundamental analysts. So, at least for the bulk of your “serious” money, sticking with the experts is the way to go.

But if you’re like me, you are also somewhat of a “do-it-yourselfer” and enjoy getting down and dirty investigating and analyzing potential investment ideas of your own. As I wrote in How to Pick Industry Sectors, there are two main ways to pick stocks: (1) top-down, where you start by analyzing macroeconomic themes and then zero in on individual stocks that fit those themes; and (2) bottom-up, where you focus on analyzing individual companies and select a portfolio of stocks based solely on their individual business performance without regard to their industry sector.

Top-down investing requires the mind of a philosopher, economist, scholar, and industry expert. It’s best left to professionals who have the time to see the big picture and forecast the future. But bottom-up investing is more manageable, especially if you’ve isolated a fixed set of fundamental and technical criteria that you can screen for over a universe of stocks.

This segues beautifully into today’s topic: the best stock screening tools on the web that are FREE.

1. Best General Stock Screener

My choice for best general stock screener is Finviz.com. It’s got a tremendous number of data fields that you can select for filtering, ranging from descriptive (e.g., market cap, industry sector) to fundamental (e.g., PE ratio, return on equity) to technical (e.g., crossing above 50-day moving average, head and shoulders pattern). If my employer didn’t provide me access to a Bloomberg terminal, Finviz would be my first stop in stock screening.

A few years ago, my answer would have been MSN Deluxe Stock Screener. But Microsoft (NasdaqGS: MSFT) in its infinite stupidity decided to discontinue this fabulous free tool back in November 2009. All that’s left are some mediocre non-backtested screens.

2. Best Earnings Surprise/Revision Screener

Chicago-based Zacks Investment Research believes in the predictive power of a company’s earnings momentum. Specifically, a company’s stock has a tendency to rise after reporting earnings that are higher than analyst estimates, as well as after analysts raise their earnings estimates for an upcoming quarter. If you agree, then you’ll love Zacks.com’s stock screens for earnings surprises and earnings revisions.

3. Best Mutual Fund Screener

Morningstar is no surprise here. It’s not as good as Morningstar’s premium fund screener (duh), but it provides access to Morningstar’s five-star rating system, as well as expense ratios, equity style, and management tenure. Not bad, and the price is right.

4. Best ETF Screener

Etfdb.com is the winner. Its database is comprehensive with 1658 ETFs. You can sort the entire ETF database by a number of data fields, including expense ratio, market return, beta, and dividend yield. I can’t stress enough the importance of the sort function. Without that, it wouldn’t be nearly half as useful. With one click, I discover that the ETN with the highest dividend yield is UBS ETRACS 2x Leveraged Long Wells Fargo Business Development Co. (NYSE: BDCL) at 18.06% and the ETF with the cheapest expense ratio is Schwab U.S. Broad Market (NYSE: SCHB) at 0.04% per year.

5. Best Seasonality Screener

It’s hard to find a free tool on the web that tells you which stocks perform best during particular months of the year. In fact, I am aware of only two, so they win: equityclock.com and paststat.com. Unfortunately, even these tools don’t give you a ready-made list of best-performing stocks in a given month; you must input your own individual stock symbols and see how they have performed in each month of the year. Better than nothing, and if you input enough tickers, you’re bound to find one that performs well in the upcoming month. For example, through trial and error, I’ve discovered that Oracle (NasdaqGS: ORCL) performs best in the month of June.

6. Best Popularity-Contest Screener

Motley Fool CAPS rates stocks on a 1-5 scale based on the “outperform” and “underperform” votes of its 74,000 players. The more players that vote a stock “outperform,” the higher the stock’s rating and vice versa. Popular stocks sometimes do well in momentum-driven bull markets, but usually get slaughtered in choppy or bear markets. Consequently, I don’t think rating stocks by popularity contest has any value over a full market cycle, so I ignore the CAPS stock ratings. But the CAPS screener lets you dig deeper and focus only on the “all-star” voters – those people whose stock picks have outperformed at least 80% of the other players – and I like to see what stocks these all-stars have given “thumbs up” to.

7. Best Mechanical Investing Screeners

Sometimes it’s better to rely on proven stock-screening strategies and not try to reinvent the wheel. Meetinvest.com offers 12 stock screens based on the investment strategies of famous academics and money managers that have market-beating backtested results. Just click on “Run Strategies” and “Create New Basket” to get daily or weekly emails with lists of the stocks that currently satisfy the screening criteria of each investment strategy.

In addition, weekly posts by rebel2011 (screen definitions) (Value Line data fields) and Bill2m (screen definitions) (AAII Stock Investor Pro data fields) provide you with several weekly stock screens that have been back-tested and proven to perform well – if you buy all of the top ten stocks in the screen. No cherry-picking allowed, because that would negate the screens’ back-tested performance numbers. Value Line screens focus on large-cap stocks and the AAII SIPro screens focus on smaller-cap stocks. Backtest.org and gtr1.backtest.org/2013 provide back-tested performance results for the Value Line and AAII SIPro screens, respectively.

8. Best Dividend Screener

Dripinvesting.org isn’t really a screener, but it provides a monthly updated list of stocks that have increased their annual dividends for at least 25 consecutive years. In these uncertain times, dividend consistency is reassuring.

[Related: Stock screen uncovers 5 high-yield stocks set to rise]

9. Best Value Stock Screeners

A value stock screen based on academic research sounds good to me, so I like to check out the Value 40 screen developed at the University of Michigan business school. I also like a small-cap value screen that uses data points that make sense to me (e.g., high insider ownership, strong returns on invested capital).

• Editors note: If you’re a DIY value investor like me, check out my Undervalued Stocks report, which uncovers the 4 secrets to finding great value investments.

10. Best Closed-End Fund Screener

Cefconnect.com has a screener for closed-end funds (CEF) that is similar to etfdb.com’s ETF screener. You start with a list of its entire CEF database of 577 names. Then you can sort by data fields such as premium/discount (very important) and distribution rate. When you click on a CEF of interest, it takes you to a page that lets you compare the annual price performance of that CEF against the performance of a relevant peer group. Useful stuff.

11. Best Options Screeners

Since I’m an options fanatic, I couldn’t end this article on stock screens without talking about options screeners as well.

Yahoo! Finance and MarketWatch offer scaled-down versions of options tools from Charles Schwab (NYSE: SCHW) subsidiary Optionetics: (1) a “Trade Search” that provides recommended options strategies based on your directional bias; and (2) an “Options Screener” that ranks by option volume, put/call ratios, and changes in historical and implied volatility.

The Optionetics website ranks stock options by comparing their current implied volatility compared to their 52-week range, so you know which options are expensive (i.e., good candidates for selling) and which are cheap (i.e., purchase candidates).

Optionistics has a “strike pegger” application that calculates the strike price that generates “max pain” for options owners in a given expiration month. Studies have shown that stocks tend to get “pinned” at the strike price where the most options contracts expire worthless.

McMillan Analysis Corp. offers a “probability of expiration” calculator, as well as implied-volatility data on stocks, including 52-week high/low percentiles.